Observation 118575: Paxillus Fr.

When: 2012-12-01

Collection location: East Bay Hills, Berkeley, California, USA [Click for map]

Who: anthony (antnat)

No specimen available


I saw three of these last week, all under coast live oak. I think the knobs at the baseof the stipe are just that.

Proposed Names

28% (1)
Recognized by sight
60% (2)
Recognized by sight: inrolled margin, brown gills staining dark brown, large size

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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“I think the knobs at the baseof the stipe are just that.”
By: Daniel B. Wheeler (Tuberale)
2012-12-04 12:30:22 PST (-0800)

Knobs on the stipe base. Never heard or seen before. I recognize many species which often form caespitose clumps which can share a common base. But then again, a 11-12 inch diameter Paxillus is new in its own right.

Please collect more.

Paxillus troubling.
By: Daniel B. Wheeler (Tuberale)
2012-12-02 21:07:10 PST (-0800)

Just checked Paxillus in Arora, and only one species might come close to the apparent size of this obs.: Paxillus vernalis (under Paxillus involutus, p. 578), said to be mycorrhizal mainly with aspen. I don’t think aspen is found in Berkeley, but perhaps a planted specimen? If not with aspen, knowing the probable host would increase our knowledge of the mycorrhizal associations, at least. Do you remember what trees were nearby, Anthony? All Paxillus require some mycorrhizal shrub or tree to survive, so there should have been a tree or large shrub near this obs.

According to Arora, most Paxillus should have brown or browning caps. This appears to be mostly white, maybe with some browning near the edge. Again, P. vernalis is said to be lighter colored than other Paxillus.

Would like to see a photo of the cap alone, as well as the stipe. The final problem with identification as Paxillus is the apparent cespitose growth. The bottom of the stipe appars to have several younger sporocarps forming, which again look mostly white. I have grown Paxillus for several years, but have never seen it form cespitose clusters before. If in fact there are multiple fruiting bodies attached at the base, this would be another important observation for this collection.

Created: 2012-12-01 20:04:44 PST (-0800)
Last modified: 2012-12-03 06:08:19 PST (-0800)
Viewed: 50 times, last viewed: 2017-06-14 09:58:33 PDT (-0700)
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