If this is the case the description for the type collection of Psilocybe cyanofibrillosa
is not a good representation of the taxon, it mentions cheilocystidia which are fusiform to lanceolate, the line drawings depict cells that are often with a bifurcate neck, it also mentions that pleurocystidia are absent.
The micrographs that Alan has provided at this site made from collections of P. “cyanofriscosa”
show lageniform cheilocystidia, the bifurcate neck looks to be either very rare or completely absent and pleurocystidia that are quite common.
I believe the fungus they are calling P. “cyanofriscosa”
to be very closely related to the southern hemisphere species P. subaeruginosa
if not conspecific.
I see Alan has provided a DNA
sequence for some of the collections of P. “cyanofriscosa”
, maybe someone would like to compare this with a sequence from P. cyanofibrillosa
if there is one available.