Observation 153338: Tricholoma virgatum (Fr.) P. Kumm.

Growing in a Sitka spruce habitat.
Caps up to 7.2 cm across.
Spore print white.
Spores ~ 8 X 6.5 microns, broadly ellipsoid and smooth.


Spores in Congo Red/KOH @ 1000X.

Proposed Names

47% (2)
Recognized by sight: pale, non-streaked cap w/sub-acute umbo. grows w/spruce.
can be similar to virgatum, which has an acutely conic umbo and a darker, streaked gray cap.
Used references: Tricholomas of NA, Bessetes, Roody and Trudell.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Spore size
By: I. G. Safonov (IGSafonov)
2013-11-20 22:38:41 -05 (-0500)

The spore width is well outside of the upper range for T. argenteum. The spores captured in the pic are in the correct alignment for measurement and are clearly over 6 um wide. The average Q values for argenteum and virgatum are 1.52 and 1.22, respectively. Other than that the visible morpohology, especially non-virgate, pale gray caps and less acute umbo, suggest argenteum.

Created: 2013-11-20 16:14:49 -05 (-0500)
Last modified: 2013-11-21 00:01:58 -05 (-0500)
Viewed: 60 times, last viewed: 2017-08-15 06:45:12 -05 (-0500)
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