Observation 198352: Tricholoma moseri Singer

Numerous specimens growing in and covered by sandy soil in the upper Sonoran region between 4500’ and 5000’ elevation. Last rain a few weeks ago. Temps: high 60’s days, high 30’s nights.


grayish and whitish gills—almost free in maturity
partial veil remnants
red sand was washed off to expose gray brown/black fibrils—fragile cap
fibrils and red sand
specimens were buried under a layer of red sand
red sand adhering to cap even after brushing

Proposed Names

45% (2)
Recognized by sight: dry pallid cap up to 7 cm with gray brown fibrils, fragile white flesh, broad grayish to whitish gills, cobwebby partial veil in button, mild odor and taste, white spore deposit, on ground under pinyon pine and juniper
Used references: http://www.azfungi.org/... and Mushrooms Demystified by D. Arora and Tricholomas of NA by Bessette, Bessette, Roody and Trudell
57% (1)
Recognized by sight: habitat and time of year point to T. moseri

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= Observer’s choice
= Current consensus


Add Comment
By: walt sturgeon (Mycowalt)
2015-02-08 15:57:36 PST (-0800)

I was fooled by the dirt/sand covering. T. terreum and T. myomyces are still considered to be one and the same by some mycologists, regardless of the presence or absence of a cortina.

By: Terri Clements/Donna Fulton (pinonbistro)
2015-02-08 13:57:26 PST (-0800)

The partial veil, mild odor and taste, small stature and fragile flesh seem to rule out most of the gray Tricholoma species according to the Arora and Bessette keys.


Hard to believe
By: walt sturgeon (Mycowalt)
2015-02-08 13:54:50 PST (-0800)

that this is a synonym or even close to T.terreum.