Observation 18637: Psathyrella longipes (Peck) A.H. Sm.

When: 2009-02-18

Collection location: Kennedy Grove Regional Park, El Sobrante, California, USA [Click for map]

Who: Richard Sullivan (enchplant)

No specimen available

I’m almost afraid to mention the word Psathyrella around here! This thing seemed really big for a Psathyrella. The caps were 7 -9 cm across. In Eucalyptus duff.

[admin – Sat Aug 14 02:01:48 +0000 2010]: Changed location name from ‘Kennedy Grove Regional Park, El Sobrante, Contra Costa Co., California, USA’ to ‘Kennedy Grove Regional Park, El Sobrante, California, USA


To show how big these guys were
To show how big they were
I don’t know anything about how to use a microscope. Here are the spores as seen at 40X in a toy microscope
some more views of gill tissue through my toy microscope!
some more views of gill tissue through my toy microscope!

Proposed Names

52% (3)
Recognized by sight: Black spore print. Not on dung. Non-deliquescing cap and gills. Gills not mottled.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Byrain
2012-02-26 06:05:21 EET (+0200)

This observation needs spore measurements and we to need to know that pleurocystidia are absent to propose P. longipes or P. candolleana.

By: Erin Page Blanchard (CureCat)
2009-02-21 09:00:23 EET (+0200)

Oooh, okay, thanks for posting some more mature photos. That splitting in the middle of the cap is really suggestive of P. candolleana, and the (cheilo?)cystidia look about right.

Thanks Curecat.
By: Richard Sullivan (enchplant)
2009-02-20 04:02:50 EET (+0200)

Yeah, I had thought about P. candolleana too. This seemed much bigger and more conical, not so convex. P. candolleana opens fairly plane. and this seemed to not have many veil remnants. Next time I’m there I’ll collect it. I’m not much with a microscope though!

By: Erin Page Blanchard (CureCat)
2009-02-20 03:43:37 EET (+0200)

Superficially resembles P. candolleana with the sort of flattened, umbonate cap. Though I don’t see any veil fragments on the margin, which is common with that species, and the “snake skin” pattern on the stipe is pronounced perhaps but not uncommon.
As usual with these indistinct, variable Psathyrella, microscopy is almost certainly necessary for a positive ID to species.

Created: 2009-02-20 03:15:37 EET (+0200)
Last modified: 2016-09-02 03:50:31 EEST (+0300)
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