Notes on Clitocybe s. lato (Agaricales)

Agaricus nebularis Batsch : Fr. is approved as the lectotype of the genus Clitocybe (Fr.) Staude (Agaricales: Tricholomataceae). Lepista (Fr.) W.G. Smith is a younger taxonomic synonym. Diagnostic characters of Clitocybe are discussed; among the less known ones are: (i) a proportion of the detached spores adhere in tetrads in microscopic mounts, (ii) the spore wall is cyanophilic, and (iii) the mycelium is capable of reducing nitrate. Three new nomenclatural combinations in Clitocybe are made. The new genus Infundibulicybe Harmaja, with Agaricus gibbus Pers. : Fr. as the type, is segregated for the core group of those species of Clitocybe s. lato that do not fi t to the genus as defi ned here. Infundibulicybe mainly differs from Clitocybe in that: (i) the spores do not adhere in tetrads, (ii) all or a proportion of the spores have confl uent bases, (iii) all or most of the spores are lacrymoid in shape, (iv) the spore wall is cyanophobic, and (v) the mycelium is incapable of reducing nitrate. Thirteen new nomenclatural combinations in Infundibulicybe are made. Two new nomenclatural combinations are made in Ampulloclitocybe Redhead, Lutzoni, Moncalvo & Vilgalys (syn. Clavicybe Harmaja), a recent segregate of Clitocybe.