Biological Species in Pleurotus
ISG III. Pleurotus populinus O. Hilber and O.K. Miller in Vilgalys et al. 1993.
Nomenclatural history: The species epithet is quite recent, and therefore has not been transferred. Although it appears strange to have the authors of the epithet different from authorship of the paper, this is straightforward and in accordance with the ICBN.
Typification: Holotype: UNITED STATES, Idaho, McCall, 27.VI.80, O.K. Miller no. 18812 (VPI).
Taxonomic history: Until recently, two names were used for North American pleurotoid (not strongly stipitate) species of Pleurotus: P. ostreatus and P. sapidus. The latter is better represented by P. pulmonarius. Pleurotus populinus was identified using compatibility tests, when collections chiefly from Populus wood were found to be incompatible with collections under either common-usage name. Morphotaxonomic characters for identification of P. populinus are subtle and difficult, centering on its common host, Populus spp.
Genetic isolation history: Vilgalys et al. (1993) reported that two collections of P. populinus were incompatible with six collections of P. ostreatus and three collections of P. pulmonarius. Petersen and Hughes (unpubl. data) have confirmed this result, using different collections. Petersen and Hughes (unpubl. data) showed that TENN 56749 (see below) was incompatible with P. ostreatus and P. pulmonarius.
Mating system: tetrapolar.
Self-cross (unpubl. data): UNITED STATES, Utah, Iron Co., Brian Head Ski Area, 28.VII.98, coll. D. Kahn, Tennessee tracking no. 9936 (TENN 56749). Tester strains: 9936:2 = A1B1; 9936:5 = A2B2; 9936:6 = A1B2; 9936:3 = A2B1.