Pseudosperma friabile (Matheny & Kudzma) Haelew., Index Fungorum 436: 1 (2020).

≡ Inocybe friabilis Matheny & Kudzma, J. Torrey Bot. Soc. 146(3): 226 (2019). [Basionym]

Note.

This combination was made, based on phylogenetic evidence. Pseudosperma friabile is most closely related to P. gracilissimum (Matheny & Bougher) Matheny & Esteve-Rav. and P. keralense (K.P.D. Latha & Manim.) Matheny & Esteve-Rav., deep in the Pseudosperma clade ( fide Matheny 2005, Matheny and Kudzma 2019).