K. W. Hughes, D. Mather (undergraduate) and R. H. Petersen (2010). A new genus to accommodate Gymnopus acervatus (Agaricales). Mycologia 102(6);1463-1478.
Petersen, R.H. and Hughes, K.W. (2010) The genus Xerula. Nova Hedwigia Beiheft 136. J. Cramer Publ. Stuttgart 625pp
Petersen, R.H. and K. W. Hughes (2009) Names, Names, Names: When nomenclature meets molecules. 18 (1): 22-28
Hughes, K.W., R. H. Petersen and E. B. Lickey (2009) Using heterozygosity to estimate a percent DNA sequence similarity for environmental species delimitation across basidiomycete fungi.
New Phytologist 182:795-798
Petersen, R.H. 2008. Species of Xerula from Sub-Saharan Africa. Fungal Diversity 30:121-147.Xerula Africa
Ronald H. Petersen, Karen W. Hughes, Edgar B. Lickey, Alexander E. Kovalenko, Olga V. Morozova and Nadezhda V. Psurtseva (2008) A new genus, Cruentomycena, with Mycena viscidocruenta as type species. Mycotaxon 105:119-136.
Hughes, K.W., Petersen, R.H., Mata, J-L, Psurtseva, N.V., Kovalenko, A.E., Morozova, O.V., Lickey, E.B., Cifuentes Blanco, J. Lewis, D.P., Nagasawa, E. , Halling, R.E., Takehashi, S., Aime, M.C., Henkel, T. 2007. Megacollybia (Agaricales). Report of the Tottori Mycological Institute 45:1-57
- Lickey, E.B., Tieken, S.M., Hughes, K.W. and Petersen, R.H. 2007. The Mushroom TWiG: a Marvelous Mycological Menegerie in the Mountains. Southeastern Naturalist Special Issue I: 73-82.
- Petersen, R.H. and Hughes, K.W. Some agaric distributions involving Pacific landmasses and Pacific Rim. Mycoscience 48(1):1-14.
- Hughes, K.W. and Petersen, R.H. (2007 maybe) Relationships among Collybia s. str. from Greenland, North America and Eurasia.p 99-105 In: Meddelelser om Gronland, Bioscience: Arctic and Alpine Mycology 9: Eds D. Boertmann and H. Knudsen. 161pp.
- Mata, J.L., Hughes, K.W. and Petersen, R.H. Am investigation of /omphalotaceae (Fungi:Eugarics) with emphasis on the genus Gymnopus. Sydowia 58 (2):191-289.Gymnopus
- Spatafora, J.W., Hughes, K.W. and Blackwell, M.B., Eds. 2006. A Phylogeny of Kingdom Fungi: Deep Hypha Issue. Mycologia 98 (6): 1105pp.
- Badalyan, S.M., Hughes, K.W., Sakeyan, C.Z. and Helmbrecht, E. (2006) Morphology, growth characteristics and genetic variability of the edible medicinal mushroom Flammulina velutipes (W. Curt.: Fr.) Singer collections. Int. J. Med. Mushrooms 8:263-278.
- Mata, J. L., Hughes, K.W. and Petersen, R.H. (2006) An investigation of /omphalotaceae (Fungi: Euagarics) with emphasis on the genus Gymnopus. Sydowia: 59(2) 181-289.
- P. Brandon Matheny, Zheng Wang, Manfred Binder, Judd M. Curtis, Young Woon Lim, R. Henrik Nilsson, Karen W. Hughes, Valérie Hofstetter, Joseph F. Ammirati, Conrad L. Schoch, Ewald Langer, Gitta Langer, David J. McLaughlin, Andrew W. Wilson, Tobias Frøslev, Zai-Wei Ge,Richard W. Kerrigan, Jason C. Slot, Zhu-Liang Yang, Timothy J. Baroni, Michael Fischer, Kentaro Hosaka Kenji Matsuura, Michelle T. Seidl, Jukka Vauras and David S. Hibbett (2006) Contributions of rpb2 and tef1 to the phylogeny of mushrooms and allies (Basidiomycota, Fungi) Molecular Phylogenetics and Evolution: In Press
- P B. Matheny, J.M. Curtis, V. Hofstetter, M.C. Aime, J-M Moncalvo, Z-W Ge, Z-L. Yang, J.C. Slot, J.F. Ammirati, T.J. Baroni, N.L. Bougher, K.W. Hughes, D.J. Lodge, R.W. Kerrigan, M.T. Seidl, D.K. Aanen, M. DeNitis, G.M. Daniele, D.E. Desjardin, B.R. Kropp, L.L. Norvell, A.Parker, E.C. Vellinga, R.Vilgalys, D.S. Hibbett (2006) Major clades of Agaricales: a multi-locus phylogenetic overview. Mycologia 98:984-997.
- Timothy Y. James, Frank Kauff', Conrad L. Schoch, P. Brandon Matheny, Valerie Hofstetter, Cymon J. Coxlt, Gail Cel, Cecile Gueidan, Emily Fraker, Jolanta Miadlikowska, H. Thorsten Lumbsch, Alexandra Rauhut, Valerie Reeb, A. Elizabeth Arnoldl, Anja Amtotf, Jason E. Stajich, Kentaro Hosaka, Gi-Ho Sung, Desiree Johnson, Ben O'Rourke, Michael Crockett, Manfred Binder, Judd M. Curtis, Jason C. Slot, Zheng Wang, Andrew W. Wilson, Arthur Schβler, Joyce E. Longcore, Kerry O'Donnell, Sharon Mozley-Standridge , David Porter, Peter M. Letcher , Martha J. Powell, John W. Taylor, Merlin M. White, Gareth W. Griffith, David R. Davies, Richard A. Humber, Joseph B. Morton, Junta Sugiyama, Amy Y. Rossman, Jack D. Rogers, Don H. Pfister, David Hewitt, Karen Hansen, Sarah Hambleton, Robert A. Shoemaker, Jan Kohlmeyer , Brigitte Volkmann-Kohimeyer, Robert A. Spotts, Maryna Serdani, Pedro W. Crous, Karen W. Hughes, Kenji Matsuura, Ewald Langer , Gitta Langer, Wendy A. Untereiner, Robert Lucking, Burkhard Budel, David M. Geiser, Andre Aptroot, Paul Diederich, lmke Schmitt, Matthias Schultz, Rebecca Yahr, David S. Hibbett, Francois Lutzoni, David J. McLaughlin, Joseph W. Spatafora & Rytas Vilgalys (2006) Reconstructing the early evolution of Fungi using a six gene phylogeny. Nature 443:818-822.
- Lickey, E.B., Tieken, S., Hughes, K. W. and Petersen, R.H. (2006) The mushroom TWIG: A marvelous mycological menagerie in the Mountains. Southeastern Naturalist (In Press)
- Kruger, D., Petersen, R.H. and Hughes, K. W. (2006) Molecular phylogenies and mating study data in Polyporus with special emphasis on group’ Melanopus’ (Basidiomycota). Mycological Progress 5:185-206.
- Suzanna M. Badalyan, Karen W. Hughes, and Elizabeth Helmbrecht (2005) Genetic variability of Flammulina velutipes collections from Armenia. In: Genetic and Cellular Biology of Basidiomycetes IV. Congreÿÿso Nacional de Física Médica, Pamplona, Spain, 3- 6 June 2005.
- Lechner, B. E., Petersen, R. H. , Rajchenberg, M. and Alberto, E. (2002) 2004. Presence of Pleurotus ostreatus in Patagonia, Argentina. Rev. Iberoam Micol.: 111-114
- Petersen, R. H. and Hughes, K.W. 2004. Une Nouvelle espece de Xerula, Xerula limonispora. Bull Soc. Mycol. Fr. 120:37-49.
- Mata, J.L., Halling, R.E., abd Petersen, R.H. 2004. New species and mating system reports in Gymnopus (Agaricales) from Costa Rica. Fungal Diversity 16:113-129.
- Krüger D., Hughes, K.W. & Petersen, R.H. (2004) The tropical Polyporus tricholoma (Polyporaceae) - taxonomy, phylogeny, and the development of methods to detect cryptic species. Mycological Progress 3:65-79.
- Petersen, R.H. and Hughes, K.W. (2004) A contribution to a monograph of the genus Lentinellus. Bibliotheca Mycologia 198:1-180.
- Hughes, K. W. and Petersen, R.H. (2004) A phylogenetic reconstruction of Lentinellus Bibliotheca Mycologia 198: 249-268.
- Petersen, R.H. 2004. Type specimen studies in Lentinellus. Bibliothec. Mycol. 198:181-248.
- Mata, J. L., Hughes, K. W. and Petersen, R. H. (2004) Phylogenetic placement of Marasmiellus juniperinus. Mycoscience 45:214-221
- Mata, J.L., Halling, R.E., Hughes, K.W. and Petersen, R.H. (2004) Rhodocollybia (Agaricales) in Neotropical Montane Forests. Mycological Progress 3(4):337-351.
- Badalyan Suzanna M. and Hughes, Karen W. (2004) Genetic variability of Flammulina velutipes and Pleurotus ostreatus collections from Armenia. In: Proceedings of the XVIth International Congress on the Science and Cultivation of Edible and Medicinal Fungi. Eds: Romaine, C.P., Keil, C.B., Rinker, D.L. and Royse, D.J., Miami, USA
- Mu, Z. abd Petersen, R.H. 2004. Notes on tropical boletes from Asia. Acta Botanica Yunnanica. 26:619-627.
- Joaquín Cifuentes, Ronald H. Petersen and Karen Hughes: Campanophyllum: a new genus for an old species name. Mycological Progress 2(4): 285-296 (2003).
Abstract: Campanophyllum is proposed as a new genus name to accommodate Lentinus proboscideus Fries, based on morphological and molecular data from collections made in Colombia, Costa Rica, Ecuador and Mexico. A neotype specimen is designated. The taxonomic circumscription of the new genus is compared to those of a wide array of agaric genera having cyphelloid, pseudostipitate members. Based on ribosomal large subunit DNA data, Campanophyllum appears to be placed in the “/gloeostereae” clade where it is nested with Cheimonophyllum, Chondrostereum and Gloeostereum. Taxonomical novelties: Campanophyllum Cifuentes & R.H. Petersen gen. nov.; Campanophyllum proboscideum (Fr.) Cifuentes & R. H. Petersen comb. nov
- Lickey, E.B., Hughes, K.W. and Petersen, R.H. (2003) Variability and phylogenetic incongruence of an SSU nrDNA Group I intron in Artomyces, Auriscalpium and Lentinellus (Auriscalpiaceae: Homobasidiomycetes). Mol. Bio. Evol. 20 (11): 1909-1916 Click here to view paper
- Lickey, E.B., Hughes, K.W. and Petersen, R.H. (2003) Phylogenetic and taxonomic studies in Artomyces and Clavicorona (Homobasidiomycetes: Auriscalpiaceae) Sydowia 55 (2):181-254.
- Petersen, R.H. and Hughes, K.W. Phylogenetic examples of Asian biodiversity in mushrooms and their relatives. Fungal Diversity 13:95-109
- Lickey, E. B., Hughes, K.W. and Petersen, R.H. (2002) Biogeographical patterns in Clavicorona pyxidata. Mycologia 94(3):461-471. Click here to view paper
Abstract:Artomyces pyxidatus (Auriscalpiaceae) is a lignicolous, coralloid basidiomycete found throughout temperate regions of the Northern Hemisphere. Previous studies established that populations from the eastern United States, Sweden, and China were conspecific based on mating compatibility and enzyme profiles. In this study, mating compatibility was extended to include collections from Russia, Costa Rica, Mexico, and Utah. The molecular diversity of A. pyxidatus was examined by DNA sequence and restriction site analyses of the nuclear ribosomal internally transcribed spacer region (ITS1–5.8S-ITS2). A phylogenetic analysis of twelve isolates based on ITS sequences revealed a broad geographical pattern in which Eurasian isolates comprise a sister clade to North American isolates. North American isolates appear to be further subdivided into northeastern and southwestern clades. A survey of 255 A. pyxidatus isolates using restriction enzymes revealed variable RFLP patterns that follow similar geographical patterns.
- Mata, J.L. and Petersen, R.H. 2001. Type studies in New World Lentinula. Mycotaxon 79:217-229.
Abstract: Discovery of two biological species within putative Lentinula boryana led to examination of type specimens of names previously listed in synonymy under L. boryana. Shape of cystidia and spore dimensions were diagnostic in assigning each type collection to a morphological species. Armillaria raphanica is the most priorable basionym representing the "non-boryana" taxon, and the epithet is recombined in Lentinula.
- Mata, J.L., and R.H. Petersen. 2000 (2001) A new species of Lentinula (Agaricales) from Central America. Mycoscience 41: 351-355.
- Hughes, K. W. and Petersen, R. H. (2001) Apparent hybridization, recombination and gene conversion of the ribosomal DNA repeat in the mushroom genus Flammulina. Mol. Biol. Evol. 18:94-96.
- Hughes, K.W., R.H. Petersen, J.E. Johnson, J-M. Montcalvo, R. Vilgalys, S.A. Redhead, T. Thomas, and L.L. McGee. 2001. Infragenic phylogeny of Collybia s. str. Based on sequences of ribosomal ITS and LSU regions. Mycol. Res. 105: 164-172.
- Jin, J-K, Hughes, K.W. and Petersen, R.H. 2001. Biogeographical patterns in Panellus stypticus. Mycologia 93:309-316
Abstract: Panellus stypticus fruits widely in Northern Hemisphere temperate forests but has also been collected in Alaska, Costa Rica, Australia and New Zealand. Previous studies established that there was a single biological species across eastern North America, Russia, Japan and New Zealand. In order to examine phylogenetic and biogeographical patterns within this species, the ribosomal ITS1-5.8S-ITS2 region was amplified for 67 collections representing North America, Eurasia, Australia and New Zealand and was sequenced for ten exemplars selected from different geographical areas. The amplified ITS sequence length for collections from New South Wales and Tasmania (Australia) and New Zealand was consistent within each of these geographical areas but varied between areas and was shorter than the ITS region for Northern Hemisphere collections. Length changes were due to a number of deletions. Deleted regions totaled 15 bp in collections from New South Wales, 29 bp from Tasmania and 88 bp from New Zealand. Parsimony analysis based on ITS sequences produced two major clades, a Northern Hemisphere clade and an Oceanian clade. The collection from New South Wales was basal to the Oceanian clade with collections from Tasmania and New Zealand as derived. Restriction fragment length polymorphisms based on BstZ I, Dra I and Hinf I identified several biogeographically separated haplotypes within this species. In the Northern Hemisphere, an eastern North American haplotype was separated from other P. stypticus collections that extended from Pacific North America to Asia. European collections also shared a unique haplotype. The presence of a nuclear ribosomal large subunit group I intron was inferred in all Northern Hemisphere collections and in collections from New South Wales by length variation of the PCR product and by sequencing of selected exemplars. ITS sequence data and the presence of a group I intron in the Northern Hemisphere and New South Wales collections provide evidence that Northern Hemisphere and Southern Hemisphere distributions were connected through South East Asia.
- Jin, J-K, Hughes, K.W. and Petersen, R.H. 2001. Phylogenetic relationships of Panellus (Agaricales) and related species based on morphology and ribosomal large subunit sequences. Mycotaxon 79:7-21
Abstract: Panellus, sensu lato has included putatively related taxa with uncertain affinities. Previous researchers suggested that Dictyopanus, a poroid mushroom, was closely related to the gilled Panellus, but affinities of Dictyopanus and Panellus to segregate genera of Tectella, Pleurotopsis and Sarcomyxa remained uncertain. Representative specimens and isolates of eight species of Panellus s.l. and Dictyopanus were examined; P. stypticus, P. mitis, P. ringens, P. violaceofulvus, P. serotinus, P. patellaris, P. longinquus and Dictyopanus pusillus. Phylogenies based on morphology and ribosomal large subunit DNA sequences were constructed. Both methods supported five clades: 1) D. pusillus and P. stypticus; 2) P. ringens and P. violaceofulvus; 3) P. mitis; 4) P. serotinus: and 5) P. patellaris. Inclusion of sequences for Resinomycena acadiensis, Mycena rutilanthiformis and M. clavicularis showed that Panellus s.l. was polyphyletic. Generic designations exist for all clades or terminal taxa except for Panellus mitis which may require new generic placement. Both P. stypticus and D. pusillus share a homologous Group I Intron at the same position of the ribosomal large subunit gene, further supporting a close relationship between Dictyopanus and Panellus.
- Petersen, R.H., and C. Scates. 2000 (2001). A new species of Ramaria subg. Ramaria from western North America. Karstenia 40: 139-142.
- Zang, M., Li, T-H. and Petersen, R.H. 2001. Five new species of Boletaceae from China. Mycotaxon 80:481-487.
- Petersen, R.H. 2000. New species of Lentaria (Fungi:Aphyllophorales): redescription and mating systems of L. surculus and L. byssiseda. Rev. Biol. Trop. 48:555-567.
- Methven, A., Hughes, K. and Petersen, R.H. (2000) Flammulina velutipes RFLP patterns identify species and show biogeographical patterns within species. Mycologia 92:1064-1070.
- Petersen, R. H. and Hughes, K. W. 1999. Species and speciation in mushrooms. BioScience (June issue).
Abstract: This paper summarizes species concepts in fungi and suggests a possible solution to the problem of differing species concepts.
- Redhead, S. A. and Petersen, R. H. 1999. New species, varieties and combinations in the genus Flammulina. Mycotaxon 71:285-294.
Abstract: In order to facilitate a series of studies on the systematics of Flammulina, the basionym of the type species, Agaricus velutipes, is epitypified, two new species epithets and one varietal name are proposed (F. populicola, F. rossica and F. velutipes var. lupinicola), and two new combinations are published (F. elastica [= Agaricus elasticus] and F. elastica f. longispora [= F. velutipes f. longispora]).
- Hughes KW, McGhee LL, Methven AS, Johnson JE, Petersen RH. 1999. Patterns of geographic speciation in the genus Flammulina based on sequences of the ribosomal ITS1-5.8S-ITS2 area. Mycologia 91(6):978-986.
Abstract: Previous studies based on morphology and on ability to intercross suggested that new biological and morphological species were sheltered within the genus Flammulina as well as varieties within F. velutipes. The currently described or proposed Northern Hemisphere Flammulina species are F. "mexicana", F. populicola, F. rossica, F. ononidis, F. elastica, F. fennae and F. velutipes. Within F. velutipes are F. velutipes var. velutipes, var. "lupinicola," and var. lactea. The ribosomal ITS1-5.8S-ITS2 region was sequenced for eighteen geographically diverse Flammulina collections, including the three F. velutipes varieties. Results of Neighbor Joining and Parsimony analysis produced five distinct Northern Hemisphere clades, a clade consisting of F. velutipes together with it’s varieties, a clade consisting of F. populicola and F. "mexicana", and clades representing F. fennae, F. rossica and F. elastica together with F. ononidis. Data are consistent with the hypothesis that F. populicola is a relatively old species which has diverged significantly on different continents, possibly giving rise to F. "mexicana" in North America. The ITS sequence for Flammulina stratosa, an isolate from New Zealand, is highly divergent from all other Flammulina isolates and may represent an ancient endemic or the product of very rapid evolution. Species diversity is highest in Europe and suggests that Europe may be a center of diversity for this group
- Petersen RH, Hughes KW, Redhead SA, Psurtseva N, Methven AS. 1999. Mating systems in the Xerulaceae (Agaricales, Basidiomycotina): Flammulina. Mycoscience 40:411-426.
Abstract: Recently published taxonomic circumscriptions for taxa within Flammulina encouraged mating studies to confirm or reject these names of taxa. Three categories of pairing experiments were performed: 1) self-crosses of monokaryon isolates of exemplars of putative taxa; 2) inter-exemplar pairings among exemplar strains; and 3) pairings between exemplars and 87 unidentified strains which were grouped on this basis. Mating experiments could distinguish F. velutipes from other taxa, but not among infraspecific taxa of F. velutipes (vars. velutipes, lactea and lupinicola) and monokaryons of all these taxa were partially compatible with those of F. ononidis. Likewise, isolates of F. rossica and F. elastica were partially compatible with one another but incompatible with those of other taxa. All other taxa (F. mexicana, F. stratosa, F. populicola, F. fennae) appeared to be genetically isolated. Low levels of hybridization between F. velutipes and F. populicola and between F. velutipes and F. rossica/F. elastica were also noted.
- Redhead SA and Petersen RA. 1999. Research on wild Enoki. Mushroom world 9(4):4-7
- Hughes, K.W., T. Toyahara and R.H.Petersen (1998) Disjunct populations of Pleurotopsis longinqua. Mycologia 90 (4):595-600
Abstract:The known distribution of Pleurotopsis longinqua is restricted to southeastern Australia, New Zealand, Patagonia, and the northern Pacific coast of North America. Previous studies demonstrated that isolates from all of these areas were sexually compatible (i.e. were the same biological species). Intercompatibility studies, however, did not provide information about genetic (evolutionary) relationships among the disjunct populations. Restriction fragment patterns of the nuclear ribosomal ITS1-5.8S-ITS2 were compared for isolates from each geographical region to estimate genetic divergence. Only one enzyme, Taq I, discriminated between different collections. To further examine genetic divergence, the ITS1-5.8S-ITS2 region was sequenced for one collection from each geographical area. Only four base-pair differences were observed among isolates from New Zealand, Argentina and Washington State. The remarkable similarity of these collections suggests that the current disjunct distribution is not very old.
- Petersen, Ronald H. and Karen W. Hughes. (1997) Mating systems in Omphalotus (Paxillaceae, Agaricales). Syst. Evol. 211:217-229.
Pairings of monokaryon cultures representing Omphalotus illudens (eastern North America), O. nidiformis (southeastern Australia), O. olearius (southern Europe), O. olivascens (North American Pacific coast), and O. subilludens (southern North America) showed widely variable compatibility patterns. Omphalotus olearius X O. subilludens X O. olivascens showed high compatibility, while O. illudens was significantly less compatible with all other taxa. Isolates of Omphalotus nidiformis represented an almost genetically isolated biological species. The role of partial compatibility in nomenclatural ranking is discussed.
- Hughes, Karen W. and Ronald H. Petersen. (1997) Relationships between Omphalotus species based on RFLP patterns of the ribosomal ITS1-5.8S-ITS2 region. Plant Syst. Evol. 211:213-237
Abstract: Genetic relationships for several species of the fungus Omphalotus were estimated by comparing the presence or absence of restriction sites in the ITS1-5.8S-ITS2 region of nuclear ribosomal DNA. Results place O. olearius (European), O. subilludens (Florida), and O. olivascens (California) in a single clade. O. illudens (Appalachians), usually thought to be related to O. subilludens, was placed in a second clade, more closely related to O. nidiformis (Australia). O. mexicana, a blue-black species from Mexico is distinct from all other examined Omphalotus species.
- Gordon, S.A. & R.H. Petersen. 1998. Infraspecific variation among geographically separated collections of Marasmius scorodonius. Mycotaxon 69: 453-466.
Abstract: Comparative morphology, mating compatibility, and extracellular laccase analyses were used to provide information on infraspecific variation within geographically separated collections of Marasmius scorodonius. Collections from North America and Europe were used for these studies. Morphological studies revealed one morphological species and mating tests revealed almost complete intercompatibility (one biological species). Laccase isozyme profiles showed two distinct isozymes for all North American collections and two different isozymes for all European collections, suggesting that intercontinental genetic divergence has occurred.
- Petersen, R.H. & J. Cifuentes-Blanco. 1998. Mating systems of three Mexican Aphyllophorales. Folia Cryptog. Estonica 23: 111-117.
Abstract: Three collections of Aphyllophorales from Mexico, Cymatoderma caperata, C. dendriticum and Echinochaete brachyporus exhibit tetrapolar mating systems. Cymatoderma dendriticum produces asexual spores in culture.
- Redhead, S. A., Petersen, R. H. and Methven, A. S. 1998. Flammulina (Agaricales): F. stratosa, a new New Zealand species distantly related to the cultivated Enoki mushroom. Can J. Bot. 76:1589-1595.
Abstract: A new species, Flammulina stratosa Redhead, Petersen and Methven, sp. nov. is described from living Nothofagus from New Zealand. It is characterized by a thick, gelatinized mediopelis that virtually replaces all other pilear tramal tissues and is comparable with Flammulina similis. Cultures and mating systems are described
- Wise, K. & R.H. Petersen. 1998. A Natural History of Mt. LeConte (book). Univ. Tennessee Press. 179 pp.
- Gordon, S. A. & R. H. Petersen. 1997. Infraspecific variation among geographically separated collections of Marasmius androsaceus. Mycol. Res. 101: 365-371.
- Johnson, J. E. & R. H. Petersen. 1997. Mating systems in Xeromphalina species. Mycologia 89: 393-399.
- Petersen, R. H. 1997. Mating systems in Hymenomycetes: new reports and taxonomic implications. Mycotaxon 63:225-259
- Petersen, R. H. and K. W. Hughes. (1997) A new species of Pleurotus. Mycologia 89 (1): 173-180.
Abstract: A new species, Pleurotus abieticola, was collected in far eastern Russia. We show that Pleurotus abieticola is reproductively isolated from other Pleurotus species. Comparisons of ribosomal ITS DNA-sequence data groupediP. abieticola with monomitic pleurotoid species of the genus, while cluster analysis (Neighbor Joining) and parsimony analysis indicated that P. abieticola was distinct from extant species. The combination of differences in morphology, reproductive isolation, substrate preference and DNA sequence justifies the proposal of a new species.
- Petersen, R. H., David B. G. Nicholl, and Karen W. Hughes. (1997) Mating systems of some putative polypore-agaric relatives. Plant Systematics and Evolution 207:135-158
Abstract: Mating systems are reported for taxa of polypores and agarics considered related. Taxa are Dictyopanus pusillus, Favolus alveolaris, F. teniculus, Lentinus bertierii, L. crinitis, L. punctaticeps, L. strigellus, L. strigosus, L. suavissimus, Pleurotus australis, P. levis, P. tuberregium, Polyporus ciliatus, P. elegans, P. squamosus and P. varius. All are tetrapolar except Polyporus elegans.
- Petersen, R. H. & S. C. McCleneghan. 1997. Reports on long-distance sexual compatibility in Agaricales. Nordic J. Bot. 17:419-432.
- Petersen, R. H & I. Krisai-Greilhuber. 1996. An epitype specimen for Pleurotus ostreatus. Mycol. Res. 100: 229-235.
- Petersen, R. H & G. S. Ridley. 1996. A New Zealand Pleurotus with multiple-species sexual compatibility. Mycologia 88: 198-207.
- Lodge, D. J. (+ 24 other authors, including R. H. Petersen). 1995. A survey of patterns of diversity in non-lichenized fungi. Mitt. Eidgenoss. Forsch. Anst Wald Schnee Landsch. 70: 157-173.
- Petersen, R. H. 1995. There's more to a mushroom than meets the eye: Mating studies in the Agaricales. Mycologia 87(1): 1-17.
- Petersen, R. H & S. C. McCleneghan. 1995. Mating systems of antipodal agarics: an unreported taxon and range extensions. New Zealand J. Bot. 33: 93-98.
- Petersen, R. H. 1995. Contributions of mating studies to mushroom systematics. Canad. J. Bot. 73(Suppl.): S831-S842.
- Petersen, R. H 1995. What is on God's mind? Acta. Univ. Upsal, Symb. Bot. Ups. 30(3): 211-212.
- Wu, Q., K. W. Hughes & R. H. Petersen. 1995. A reevaluation of taxa of Clavicorona subg. Ramosa based on morphology, compatibility, and laccase electrophoretic patterns. Sydowia 47: 89-124.
- Gordon, S. A., D. E. Desjardin & R. H. Petersen. 1994. Mating systems in Marasmius: additional evidence to support sectorial consistency. Mycol. Res. 98: 200-204.
- Petersen, R. H. - & J. Cifuentes. 1994. Notes on mating systems of Auriscalpium vulgare and A. villipes. Mycol. Res. 98: 1427-1430.
- Petersen, R. H- & S. A. Gordon. 1994. Mating systems in higher basidiomycetes. New reports and new species. Mycologia 86: 743-757.
- Petersen, R.H. & A. S. Methven. 1994. Mating systems in the Xerulaceae : Xerula. Canad. J. Bot. (accepted).
- Desjardin, D. E., S. A. Gordon, & R. H. Petersen. 1993. Observations on two rhizomorph-forming species of Marasmiellus. Mycol. Res. 97: 111-122.
- Petersen, R. H. and K. W. Hughes. (1993) Intercontinental interbreeding collections of Pleurotus pulmonarius with notes on P. ostreatus and other species. Sydowia 451: 139-152.
- Petersen, R. H. & G. M. Mueller. 1993. New South American taxa of Cantharellus, C. nothofagorum, C. xanthoscyphus, and C. lateritius var. Colombianus. Bol. Soc. Argent. Bot. 28: 195-200.
- Petersen, R. H. & E. Parmasto. 1993. A redescription of Gloeostereum incarnatum. Mycol. Res. 97: 1213-1216.
- Petersen, R. H. & R. E. Halling. 1993. Mating behavior in the Xerulaceae: Oudemansiella. Trans. Mycol. Soc. Japan 34: 409-421.