Observation 46380: Kuehneromyces vernalis (Peck) Singer & A.H. Sm.

When: 2010-06-03

Collection location: Yosemite National Park, California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

Specimen available

Seems like these should be something easy like a Galerina autumnalis but the spores did not cooperate.
Growing on a large old log, very hygrophanous, a thin veil, but spores that look smooth and with a small apical pore.
The spores averaged ~ 8.0 X 5.0 microns.
Hopefully, Doug The LBM Specialist, can shed some light.
While my spore measurements seem a little larger for either K. mutabilis or K. vernalis, everything else does fit and the mutabilis is said to be a Fall mushroom.

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Sorry, missed this one.
By: Douglas Smith (douglas)
2010-07-22 12:50:44 CDT (-0400)

Yeah, this is clearly Kuehneromyces vernalis, if nothing else it is a brown spored, hygrophanous little brown job, on wood in the spring in the mountains. Galerina in the spring in CA is very rare, esp. in the mountains. But beyond that you have the grey-brown fairly smooth stipe, the stipe only has very thin fibrous surface hyphae. Galerina marginata/autumnalis should have a fibrous veil far up on the stipe (Conocybe/Pholiotina will have a veil (when it does) in the middle of the stipe), not K. vernalis. This one has a very light membranous veil that breaks off from the base of the stipe, and leaves fragments on the cap margin. Which can go away easily since it is so light. I see here, which I’ve seen before the light fibrous hyphae on the stipe surface can gather spores near the stipe apex that kinda looks like a light partial veil, but isn’t really.

K. mutabilis will have a more membranous veil near the top of stipe, with scales on the stipe beneath the veil, down the stipe. Also the stipe at the apex is rather light (pale tan to off-white) and smooth. Also that species is really rare in CA, seems to be only found near Oregon.

But that is probably a little more than you wanted to know…

Let see, you put down a spore size of 8×5um, what did I find roughly… 7×4um, so that is rather close. I need to determine the stnd. on those numbers, but it probably agrees well.

Nice spore shot by the way…

Created: 2010-06-06 20:16:17 CDT (-0400)
Last modified: 2013-12-03 13:25:16 CST (-0500)
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