Observation 63217: Pluteus thomsonii (Berk. & Broome) Dennis

When: 2011-01-16

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

Who: Douglas Smith (douglas)

Specimen available

Found under live oak. C. bay.

The first micro-shot is of the gill edge at 400x in KOH. The cheilocystidia are random, with a few (~15%) with longer nodulose extensions. Also clavate thin-walled pleurocystidia were obs.

The second micro-shot is of the cap surface at 400x in KOH. The cap surface is hymeniform, slightly random elements, mostly clavata, a few with long pointed extensions.

The third micro-shot is of spores from the gill at 1000x in KOH. The spores are ellipsiod, smooth, apr. ave. size is 6.5 × 5 um.

With the hymeniform cap surface, and the cheilocystidia with nodulose extensions, this is clearly P. thomsonii. The shape and distribution of cystidia are different than what I’ve sene in Europe, but each of the actual types are all there. The nodulose extensions seem to be rather unique, but I’m not sure I’ve seen them clearly described in sources. They usually just mention pointed long extensions, but these nodules I’ve seen in the European samples also.

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Proposed Names

92% (2)
Eye3 Eyes3
Recognized by sight
Used references: Funga Nordica, others…
Based on microscopic features: As described in the text.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-02-07 10:11:31 GMT (+0000)
Last modified: 2011-04-08 23:47:58 BST (+0100)
Viewed: 88 times, last viewed: 2018-07-22 19:15:13 BST (+0100)
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