Observation 28312: Clitopilus hobsonii (Berk. & Broome) P.D. Orton

When: 2009-10-31

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

Who: Douglas Smith (douglas)

Specimen available

Found on rotting log in swampy area, under Live oak and CA Bay.

These are white, with white fibers on cap, not hygrophanous. I found these last year, and took a look at them closer. The spores were light orange-tan in deposit. The spores under the scope with pointed, and longitudinally striate, so they are somewhat angular from the long end. Which makes me wonder if these are rally Crepidotus. But not sure yet, and I need to put these under the scope to see what I see this year.

I looked at the spore for this one, under KOH. The spores are hyaline, and in KOH, they are rather clear, and hard to see in the photos, so I won’t push them on you here. But the spores were still longitudinally striate, so it is Clitopilus. I need to go back to this one, maybe someday, and get better spore shots with Congo Red.

Species Lists


Proposed Names

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

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= Observer’s choice
= Current consensus


Add Comment
Great collection — looks like it…
By: Dimitar Bojantchev (dimitar)
2010-03-05 17:57:49 MSK (+0300)

Very interesting collection — it most likely is Clitopilus hobsonii
indeed, which has been listed as having a very broad distribution
(including the Americas). One should not preclude the possibility that
it is anew local species either. Ideally I would have loved to see a
more convincing photograph of the spores even though C. hobsonii has
rather weakly ridged to smooth spores. Sometimes Crepidotus has lobed
spores that can appear ridged under certain angles.


Created: 2009-11-17 15:31:12 MSK (+0300)
Last modified: 2009-11-17 15:31:12 MSK (+0300)
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