Observation 179763: Pluteus sect. Celluloderma
When: 2014-09-21
Who: zaca
No herbarium specimen

Notes: Average dimensions of the spores: Me = 7.4 × 6.2 µm ; Qe = 1.2 (N=22).


Mycroscopy: Cuticle;
Mycroscopy: Lamella edge;
Mycroscopy: Lamella.

Proposed Names

70% (2)
Eye3 Eyes3
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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OK! Thanks, Alfredo
By: zaca
2014-09-22 14:27:18 PDT (-0700)
probably in the P. nanus group
By: Alfredo Justo (Fredo)
2014-09-22 13:18:40 PDT (-0700)

the colors of the cap and the fact that the pileipellis elements are loosely arranged are a good match for Pluteus nanus, at least in the way I interpret the species, not everyone has the same morphological concept.

Partial answers to Alfredo questions:
By: zaca
2014-09-22 12:02:14 PDT (-0700)

- “what is the predominant morphological type of pleurocystidia?”
This is the most difficult of the questions, because I saw a great diversity in the forms of pleurocystidia. I would say that the big ones are in general elongated, almost cylindrical with pointing end; the one appearing on the bottom right in the last photo is rare. But there are also lots of small ones…

- “are the elements of the pileipellis very tightly packed together or more loosely arranged?”
It seems that the elements of the pileipellis are very loosely arranged.

- “are there caulocystidia on the stipe?”
I found no caulocystidia in the preparation made with material from the apex of the stem.

Thanks again, Alfredo, for your contribution.

cystidia and pileipellis
By: Alfredo Justo (Fredo)
2014-09-22 07:21:36 PDT (-0700)

some characters that may help narrowing down the possibilities:

- what is the predominant morphological type of pleurocystidia?

- are the elements of the pileipellis very tightly packed together or more loosely arranged?

- are there caulocystidia on the stipe?

This is a very diverse group (at least in Southern Europe) and we still have to figure out how many species are there and what are the morphological characters to separate them (if there are any). Molecular studies underway indicate we have underestimated the diversity of this group.

Thanks, Alfredo,
By: zaca
2014-09-22 06:24:46 PDT (-0700)

… for your message.
Is there anything I can do to go to the species? What are the differences between them?

Sect. Celluloderma
By: Alfredo Justo (Fredo)
2014-09-22 06:16:18 PDT (-0700)

This is probably in the cinereofuscus/pallescens group or in the Pluteus nanus complex. Both species complexes need still more work even in “well-known” areas like Europe.

Created: 2014-09-21 14:37:55 PDT (-0700)
Last modified: 2014-09-22 06:13:12 PDT (-0700)
Viewed: 54 times, last viewed: 2015-10-27 15:30:47 PDT (-0700)
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