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Noverll LL. 
“Report of the Nomenclature Committee for Fungi: 15”. 
Taxon. 2010 Feb;59(1):291-293.
Abstract
The following names are recommended for conservation: Pseudocercospora against Stigmina and Phaeoisariopsis; Boletus applanatus against B. lipsiensis ; Lyophyllum with L. semitale as conserved type; Roccellina against Roccellaria ; Psilocybe with P. semilanceata as conserved type; Calvatia nom. cons. against Lanopila ; and Phaeographis against Creographa, Ectographis, Flegographa, Hymenodecton, Platygramma, and Pyrographa and with P. dendritica as conserved type. As a result of reference under Art. 32.4, the Committee recommends that the descriptive statement accompanying publication of Ascomycota Cavalier-Smith be considered adequate for valid publication but recommends that that for Blastocladiomycota Doweld should not.

Conserve the name Psilocybe (Basidiomycota) with a conserved type. Proposed by Redhead, Moncalvo, Vilgalys, Matheny, Guzmán-Dávalos & Guzmán in Taxon 56: 255–257. 2007. Votes – 13 : 0 : 0 (92.9% recommend conservation of the genus Psilocybe with P. semilanceata as type).

Recent molecular analyses support fragmentation of the large well-known genus, Psilocybe, into two major clades. The name Psilocybe is almost universally associated with its hallucinogenic representatives, despite the fact that the currently accepted lectotype of the name is the “common moss inhabiting, non-hallucinogenic species, P. montana.” Psilocybe montana is supported in the major non-hallucinogenic clade that, if generically segregated, would leave “the hallucinogenic species without a generic name.” Additionally, Donk’s 1962 lectotypification by P. montana was preceded by a Cle- ments & Shear’s 1931 lectotypification [by P. merdaria] and so “can- not be superseded except by conservation.” Proposal 1757 proposes to conserve the name Psilocybe with the well-known hallucinogenic P. semilanceata, which itself was accepted by many authors as lecto- type between 1938–1968). The name Deconica (typified by Agaricus physaloides Bull.) is available for the non-hallucinogenic clade.

The proposers offered an alternate proposal (proposal B, not placed on the ballot) that would “leave the typification as generally, but incorrectly, accepted until now”, with P. montana as type, after explaining that the previously proposed P. merdaria is atypical of the clade and noting that then a new name would be needed for the hallucinogenic clade.

All responding Committee members unanimously voted to con- serve Psilocybe with P. semilanceata as type.
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