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Nematoctonus and the tribe resupinateae in ontario canada


, : Nematoctonus and the tribe resupinateae in ontario canada. Mycotaxon 25(2): 321-454

Eight form-species of Nematoctonus, including 5 new species, were found in Ontario, and one extralimital species is described as new. Twelve of the 16 species recognised in Nematoctonus are described. In several cases, a single form-species includes the anamorphs of more than one teleomorph species. Eight species of Nematoctonus are not known to have teleomorphs. Twelve new teleomorph-anamorph connnections are made. All teleomorphs occur in Hohenbuehelia (tribe Resupinateae), and all species of Hohenbuehelia treated have Nematoctonus anamorphs. The other genera of the Resupinateae were not nematophagous. Species of Resupinatus and Stigmatolemma lack Nematoctonus anamorphs, but have hyphal structures that suggest that they are parasitic. Asterotus and Stromatocyphella are unknown in culture. Twelve species of Hohenbuehelia, four of Resupinatus, and one in each of Asterotus, Stigmatolemma and Stromatocyphella occur, or are likely to occur, in Ontario. Hohenbuehelia is characterised by possession of hymenial metuloids and a Nematoctonus anamorph. In addition, fruit bodies of Hohenbuehelia have distinctive cystidia in the hymenium or on the surface of the pileus or stipe, which terminate in one or more hourglass-shaped cells, each surrounded by a mucoid droplet. These gloeosphex cystidia are unique among the agaric genera and resemble the capture organs of Nematoctonus. Species of Resupinatus lack metuloids, gloeosphex cystidia and Nematoctonus anamorphs, but possess diverticulate cheilocystidia and diverticulate cuticular hyphae, which are not found in Hohenbuehelia. The tribe Resupinateae should be classified in the Polyporaceae (= Pleurotaceae) to reflect the affinity of the Resupinateae with the genus Pleurotus. Parallel study of anamorphs and teleomorphs clarified the taxonomy of the Resupinateae at the generic and species levels. New species are: Nematoctonus angustatus Thorn and Barron, N. brevisporus Thorn and Barron, N. cylindrosporus Thorn and Barron, N. geogenius Thorn and Barron, N. hamatus Thorn and Barron, and N. subreniformis Thorn and Barron. New combinations are: Hohenbuehelia atrocaerulea (Fr.) Sing. var. grisea [Pleurotus atrocaeruleus var. griseus Peck, 1891] and H. tremula [Agaricus tremulus Schaeffer in Fries, 1821] Thorn and Barron.

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