Biological Species in Pleurotus
INTERSTERILITY GROUP
ISG V. Pleurotus djamor (Rumphius: Fries) Boedijn.
1959. In: De Wit, H.C.D., Ed. Rumphius Memorial Volume. 1959. In: De Wit, H.C.D., Ed. Rumphius Memorial Volume.
Nomenclatural history: The epithet djamor dates from Fries (1821), who recognized that Rumph’s (1750) polynomial name (Boletus secundus arboreus) was artificial (literally, "the second bolete on trees"). Fries proposed the epithet djamor in Agaricus. Boedijn (1959) recombined Fries’s epithet in Pleurotus.
Taxonomic history: The species has been described numerous times, drawing attention to distribution [i.e. P. ostreatoroseus Singer from Brazil; P. salmoneo-stramineus Vassily. from far eastern Russia, P. djamor (Rumph.: Fr.) Boedijn, etc.] or basidiome color. This has led to considerable confusion over use of names, several of which (i.e. P. ëous) remain unidentified. Corner (1981) correctly placed several morphological variants under the single epithet djamor, but whether color variants are separable into discrete infraspecific taxa is doubtful. Hilber (1997) took up the name P. ëous (Berkeley) Saccardo at species rank, but P. djamor predates Berkeley’s epithet (through Fries’s adoption, 1821, which also protects the epithet djamor against synonymous epithets).
Petersen (1995) reported intercollection compatibility among color forms of the species, and Nicholl (1996) expanded those data, using 35 collections from Japan, Malaysia, Central America, New Zealand, and southern North America. All collections were paired with all other collections, and all pairings were compatible. It is evident that the species supports high phenotypic plasticity, but that one biological species is circumscribed.
Genetic isolation history: Petersen and Hughes (1993) performed pairing experiments using four collections of P. djamor. Pairings within this group were compatible, but interspecific pairings against ten collections of P. pulmonarius, four P. ostreatus, and two P. cornucopiae were all incompatible.
Segedin et al. (1995) reported that P. "opuntiae" (probably P. djamor) was incompatible with P. australis, P. purpureo-olivaceus, P. pulmonarius (New Zealand isolates) and P. ostreatus (isolates from United States).
Mating system: tetrapolar.
Self-Cross: MALAYSIA, location unknown, IV.95, coll. R. Watling, Tennessee tracking number 6346 (spore print only). Fruited in vitro. Tester strains: 6346:5 = A1B1; 6346:13 = A2B2; 6346: 11 = A1B2; 6346:8 = A2B1.