Observation 28646: Coprinellus impatiens (Fr.) J.E. Lange

When: 2009-11-19

Collection location: Mill Valley, California, USA [Click for map]

Who: Erin Page Blanchard (CureCat)

Specimen available

This is one of those collections that has me torn between Psathyrella and Parasola

I am not aware of any Psathyrella species with a plicate (not to be confused with striate) pileus, and I have looked pretty extensively in the literature.

These should probably be in “Clade F (/Parasola)” of Padamsee and Methany’s article on the phylogeny of the family Psathyrellaceae.

The hymenium of this collection is non-deliquescent, as is apparent in the last image.


Old specimen. Not deliquescent.

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Eye3 = Observer’s choice
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I’ve been seeing these in the mid-peninsula area.
By: Douglas Smith (douglas)
2009-11-24 07:44:50 CST (-0600)

I’ve seen a few of these in the mid-peninsula, above Palo Alto, going back years now. Here is another obs: 1006. Seems to be one that is on that cusp betweem Psathyrella and Parasola… It is very distinctive with that pattern on the cap, it would nice to know what they are some day…

Nice example of “plicate.”
By: Dave W (Dave W)
2009-11-24 06:57:36 CST (-0600)

I imagine that the plicate/striate distinction is more difficult when the cap is immature and the folds are tighter. Does one then judge by how much of the overall cap height is lined? Also, does one choose “sulcate” to describe lines that develop as the cap dries and becomes wrinkled?

Created: 2009-11-23 20:43:35 CST (-0600)
Last modified: 2009-11-23 20:43:35 CST (-0600)
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