When: 2010-12-03

Collection location: Oakland, Alameda Co., California, USA [Click for map]

Who: Peter G Werner (pgwerner)

Specimen available

This collection has a very unusually conic to campanulate to umbonate pileus shape for this species.

[admin – Tue Feb 08 12:35:01 +0000 2011]: Changed location name from ‘Oakland, CA’ to ‘Oakland, California, USA’


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Before anyone suggests….
By: Peter G Werner (pgwerner)
2010-12-07 02:16:28 CST (-0500)

No, it isn’t Psilocybe ovoideocystidiata. The microscopic characters are consistent with the P. cyanescens group and not at all with P. ovoideocystidiata. (I’ll add some micrographs in the next few weeks, hopefully.) Also, the annulus is cortinate, not membranous, even in young fruiting bodies.

However, this is clearly an unusual collection, with a pileus shape that is very unusual for this species. I will note that the P. cyanescens group of species are largely separated by pileus shape, but I would be very reluctant to call something a new species based merely on one collection.