Observation 220395: Pluteus sect. Celluloderma Fayod
When: 2015-10-24
Who: zaca
No herbarium specimen
0 Sequences

Found on the remains of a branch of Quercus suber. At the same place also grew a specimen of Pluteus thomsonii (at least I believe so, see observation 220396). It was exactly at this place that I found last year P. hispidulus considered at observation 179899.
I found a similar specimen some years ago and, at the time, it was classified either as P. inquilinus or P. semibulbosus, being similar to the North American species P. pallidus, according to Ref. 1. I believe this is of the same species; Curiously no similar species is found in Ref. 2.


Microscopy: Spores;
Microscopy: Cheilocystidia;
Microscopy: Basidia and pleurocystidia;
Microscopy: Cheilo- (top) and pleuro- cystidia (magnify to see the dimensions);
Microscopy: Pileipellis-1;
Microscopy: Pileipellis-2;
Microscopy: Pileipellis-3 (terminal elements).
Microscopy: Caulocystidia.

Proposed Names

79% (2)
Eye3 Eyes3
Recognized by sight
61% (2)
Used references: Ref. 1: Andrew M. Minnis, Walter J. Sundberg, Pluteus section Celluloderma in the U.S.A., North American Fungi, Vol. 5 (2010).
Ref. 2: A. Justo and M.L. Castro, An annotated checklist of Pluteus in the Iberian Peninsula and Balearic Islands, Mycotaxon 112: 271-274, 2010.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: zaca
2015-10-27 17:05:44 EDT (-0400)

According to Flora Agaricina Neerlandica, Vol. 2, Pluteus inquilinus is one of the members of the Pluteus phlebophorous group. This group consist of species in subsection Eucelluloderma, distinct from _P. nanus, having hemispherical or conical pileus when young, later plano-convex or applanate, slightly hygrophanous, sometimes with translucently striated margin, pallescent to pale brown on drying. The delimitation of the species in the group are: the colour of pileus, colour of lamella edge and shape of pleurocystidia.
All the features presented from the microscopy fit very well the species Pluteus inquilinus and I was about changing my vote to “I’d Call it That” but I decided to wait until I could observe the stiptipellis, mainly because this species is the only one in that group that have caulocystidia (in young specimens, which is the case). In fact, I found caulocystidia, and just uploaded a set of photos from the microscopy, but to my surprise these are not of the form expected from the description (clavate to broadly clavate): they are more or less fusiform and some have a short neck. Thus, it may be yet another species, very close to P. inquilinus or a variation of this species. I have no way to decide.

Microscopy added.
By: zaca
2015-10-25 17:47:45 EDT (-0400)

Created: 2015-10-24 16:34:39 EDT (-0400)
Last modified: 2016-01-04 18:22:22 EST (-0500)
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