Observation 20882: Parasola Redhead, Vilgalys & Hopple

When: 2009-05-08

Collection location: Orinda, California, USA [Click for map]

Who: Richard Sullivan (enchplant)

No specimen available

Growing under some shrubs in my yard. Lots of them after recent rain.


Spores: average 13µmx 7µm, Thick walled.
You can see the little collar at the top of the stipe.
pleurocystidia- Flask shaped to globose.

Proposed Names

-56% (1)
Used references: Mykoweb.
Based on microscopic features: Spores average 13µmx7µm
85% (1)
Eye3 Eyes3
Based on microscopic features: No sclerocystidia – not auricoma. Spores the wrong shape for leiocephala, also wrong size. wrong shape spores for plicatilis

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Parts of the setae should be easy to see if they exist
By: Dimitar Bojantchev (dimitar)
2009-05-09 07:48:45 PDT (-0700)

Hi Richard, they can’t just all fall off. Some remnants should be visible. Take a piece of the epicutis and make even the sloppiest slide. You should see some parts of thick walled long cells. If none that this is not auricoma for sure.

No setae so far!
By: Richard Sullivan (enchplant)
2009-05-08 20:59:19 PDT (-0700)

Hi Dimi.
I had checked out your site and knew what to look for. Haven’t found any yet. The specimen is very dry now. So may be they are broken off or were never there . Perhaps in the morning I can get a fresh specimen and check. I’ll pour some water on there now. 80º tomorrow!

There is one key feature of auricoma — the setae..
By: Dimitar Bojantchev (dimitar)
2009-05-08 20:54:23 PDT (-0700)

There is one key feature of auricoma — the setae on the pileus.
Anything less is a crapshoot with these tiny black parasols. I tested
the macro id skills of some folks a few months ago and these are not
so easy to tell apart. The setae are key, if not present the name
should be something else. Spore shape, size, angularity, etc, help
somewhat, but as I said, auricoma has one key feature. Compare here:


Spore size.
By: Richard Sullivan (enchplant)
2009-05-08 20:31:30 PDT (-0700)

Thanks Irene. Yes, the spore size seems to suggest p. auricoma. Everyone seems to agree that the habitat is wrong for plicatilis. However the gills are still attached to this little collar and I have yet to find minute hairs on the pileus.

The parabolic shape is disturbing
By: Irene Andersson (irenea)
2009-05-08 13:52:22 PDT (-0700)

Also that it’s growing in a shady place and not in an open lawn. I don’t recognize this one (maybe leiocephala which is a bit larger than plicatilis), but there are a few more species with folded caps, the sign of the whole genus Parasola..

Folded or pleated
By: Richard Sullivan (enchplant)
2009-05-08 13:29:47 PDT (-0700)

The cap looks like it is minutely folded or pleated, like an umbrella. Hence the name plicatilis. From above the center of the cap seems buff colored and not folded. On the underside the gills are attached to a little collar around the stem.

By: Irene Andersson (irenea)
2009-05-08 09:59:52 PDT (-0700)

Why/how plicatilis? Doesn’t look like the ones I thought I knew as plicatilis, but I have to be honest, I have never checked them in the microscope either..

Created: 2009-05-08 07:19:29 PDT (-0700)
Last modified: 2009-05-08 07:19:29 PDT (-0700)
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