When: 2011-03-26

Collection location: Davis, California, USA [Click for map]

Who: Byrain

Specimen available

Growing from old rotting wood chips + Casuarina equisetifolia duff.

Spore range = (15) 16 – 20 (21) x 8 – 10 (11) µ
Average spore = 17.75 × 9.65 µ
Average Q = 1.84
20 spores measured.

Cheilocystidia rare and hard to find, pleurocystidia absent.


Spores, 1000x, mounted in KOH
Spores, 1000x, mounted in KOH
Spores, 1000x, mounted in KOH, 1 µ divisions
Pileipellis, 1000x, mounted in KOH, 1 µ divisions

Proposed Names

91% (2)
Recognized by sight
28% (1)
Recognized by sight
Used references: North American Species of Psathyrella
Based on microscopic features

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= Observer’s choice
= Current consensus


Add Comment
This is the same as…
By: Byrain
2012-06-25 06:00:03 CST (+0800)

observation 97004, which was growing a few blocks away in the same kind of habitat. And again this keys out easily to Psathyrella thomii, except that species is described as starting white then aging brown and growing “On bagasse piles from sugar mills in wet places” in Louisiana. It is also supposed to be have slightly shorter and wider spores with a bubble like germ pore, they’re not described as truncate either.