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Observation 19163: Pluteus Fr.

When: 2009-03-04

Collection location: Tomales Bay State Park, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

Specimen available
Collection number: Ron Pastorino RLP3-4-09B

Another Pluteus species(I believe) that I’m unable to id. They were growing on a piece of a branch, probably live oak. The caps were up to 5.2 cm broad and stems up to 4.5 cm long. The caps were minutely granulose and fairly striate. The pink spores were almost round(approx. 7.1 X 6.4 microns). The two micro photos are portions of the cuticle that had some sort of projections(?).
They appear to be in the Pluteus longistriatus group(Arora’s MD page 258), perhaps P.seticeps, but couldn’t find any detailed description.


Spores in Congo red @ 1000X
Gill cystidia in Congo red @ 1000X
Gill cystidia in Congo red @ 1000X

Proposed Names

57% (1)
Recognized by sight
56% (1)
Used references: Arora, Mushrooms Demystified. I think you did a very good job identifying this species, Ron.

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= Observer’s choice
= Current consensus


Add Comment
While this collection is over 10 years old,
By: Ron Pastorino (Ronpast)
2019-03-27 13:25:15 CDT (-0400)

I was able to do some additional micro work on the voucher.
The spores were; 7.5-8.1 X 6.1-7.1 microns
Q(range) = 1.12-1.27
Q(avg) = 1.31 n=10
I could not see any long projections on the pileipellis.
Also did not see any obvious Pleurocystidia. I added three photos of projections on the gill edge, which were sparse and may be Cheilocystidia(?).

what kind of pileipellis does this specimen have ?
By: else
2019-03-26 19:25:45 CDT (-0400)

For Pluteus identification, the first question is: what kind of pileipellis does it have?

The colours are wrong for P. podospileus and P. seticeps – these two species are dark brown, and have a pileipellis made up of both long, and rounded-stalked cells.