Observation 22291: Pluteus sect. Pluteus

When: 2009-03-23

Collection location: San Francisco, San Francisco Co., California, USA [Click for map]

Who: Micah Courteau (waynegrompsky)

No specimen available


Proposed Names

76% (1)
Recognized by sight

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still have doubts, but
By: Andreas Gminder (mollisia)
2009-06-19 00:42:09 PDT (-0700)

when you have examined it microscopically and they had no hooked cystidia, then it must be something else of course. But I’m still wondering, as they look so exactly like our cervinus here on wood chips or saw dust, I still can’t believe it …
Why ARORA identifies a mushroom which is said to have a cap “albo vel fumosulo [white to slightly smoky-grey]” and “glabro vel in squamas persistentes rupto [glabrous to breaking up in persistent scales]” with a Pluteus which has a cap described as “dark, frequently wrinkled” is not clear to me …. Judging from the original description it would be much more logical tom identify teh taxon magnus with Pluteus petasatus. This species is described in ARORA as “Cap whitish or pallid with brown fibrils or scales; often growing in clusters” – which fits perfect to the diagnoses of P. magnus!
Lets hope that Else reads this and has a commet to it.

Not that I know much…
By: Douglas Smith (douglas)
2009-06-18 23:17:09 PDT (-0700)

But I’ve only looked at one of these, and they were large, with fat stipes and the fairly rumpled caps. Looking at the pleurocystidia, they were certainly not P. cervinus. They did not have the hooked cystidia that are caracteristic of that common species. So, I’m not sure if P. magnus is accepted or not, but the ones I looked at are certainly a different species at least.

Not sure if Else has an opinion, she has been looking at the Pluteus of CA.

see David Arora
By: Johannes Harnisch (Johann Harnisch)
2009-06-18 16:41:05 PDT (-0700)
Pluteus magnus
By: Andreas Gminder (mollisia)
2009-06-18 15:28:19 PDT (-0700)

this was done faster then I expected. In Index Fungorum the spesies is listed, but not as a accepted species but as a doubtful one. But the description from SACCARDO is linked on this site, and this description is very probably the translations of the original description.
According to this, Pluteus magnus has a white to pale smoke-grey cap, that is smooth at first but ruptures into persistent scales. Also it is said to grow fasciculate.
When reading this description of the cap, I can’t believe that P. magnus should be a species with a drak and wrinkled cap. It should be just the opposit ….

But young P. cervinus
By: Andreas Gminder (mollisia)
2009-06-18 15:20:21 PDT (-0700)

exactly have this dark colour and also the wrinkled cap. Especially those from wood chips. Lateron the caps get plane and smooth. Interesting! I will see if I find something about this strange Pluteus magnus …

Pluteus cervinus?
By: Andreas Gminder (mollisia)
2009-06-18 06:16:59 PDT (-0700)

I don’t know Pluteus magnus (american species?), but the foto looks exactly like Pluteus cervinus.