Observation 14385: Clitopilus hobsonii (Berk. & Broome) P.D. Orton

When: 2008-11-16

Collection location: Los Trancos Preserve, Palo Alto, California, USA [Click for map]

Who: Douglas Smith (douglas)

Specimen available

Found on a well decayed log.

More of these small unknown Crepidotus found up there in a damp seepage area. I left these out overnight, until the gills became tan, to make sure I could get some spores. Maybe I’ll be able to get a species on these this time.

Ok, this one has been bothering me for awhile, about a year and half or so…

But these are small, and pure white, sessile on wood, and just looks like yet another Crepidotus. But it was kinda funny under the scope.

The micro-shot is of spores from the gill at 1000x in Meltzer’s. Here the spores are ellipsoid, and more or less hyaline, and no reactions with the Meltzer’s. But the spores are clearly longitudinally striate here.

With that sort of spore ornamentation I thought it might be easy enough to come up with. But it didn’t show up in the Crepidotus monographs, or other Crepidotus info, so that was just bothering me.

But with the spore striation it should be Clitopilus, but I could find much on Clitopilus info, that might give me more info on a sessile form. So, I tabled it. But then I got Funga Nordica recently, and for some reason I thought of this one, and thought what would Funga Nordica say? And in their Clitopilus key there are a few sessile forms listed, and a couple that are white. Using that key, I get a suggestion of Clitopilus hobsonii.

I also found on the web from Upstate New York, there was a Clitopilus key of sessile forms:


So, this looks pretty good. These aren’t some funny Crepidotus, but they really are a Clitopilus. Pretty cool.

Species Lists



Proposed Names

86% (1)
Eye3 Eyes3
Recognized by sight
Used references: Funga Nordica, web sites.
Based on microscopic features: Spores longitudinally striate.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2008-11-18 22:24:02 PST (-0800)
Last modified: 2008-11-18 22:24:02 PST (-0800)
Viewed: 228 times, last viewed: 2019-01-01 05:40:41 PST (-0800)
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