Observation 64062: Gymnopus ocior (Pers.) Antonín & Noordel.
When: 2008-06-15
Herbarium specimen reported

Notes: Original Herbarium Label: Gymnopus subsulphureus (Peck) Murrill
Re-identified to Gymnopus ocior (Pers.) Antonín & Noordel. by I. Andersson & O. Ceska – see also Vilgalys, R. 1991. Speciation and species concepts in the Collybia dryophila complex. Mycologia 83: 758-773.

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An interesting paper
By: Irene Andersson (irenea)
2013-02-03 03:19:21 PST (-0800)

“An investigation of Omphalotaceae (Fungi: Euagarics) with emphasis on the genus Gymnopus” (Mata, Hughes & Petersen 2007):
http://www.bio.utk.edu/mycology/Papers/Gymnopus.pdf

-shows that macrocharacters are not really reliable, perhaps not even microcharacters, considering how many species names that are ending up in different branches. It also shows large difficulties to circumscribe the species with the help of DNA. With lots of alternatives, it’s not obvious which differences in the base pairs that may disconnect one species from another.
Not even mating tests give obvious results.

I have looked at 96565
By: Irene Andersson (irenea)
2013-02-03 01:55:22 PST (-0800)

and would easily call it subsulphureus.

I have no doubts that ocior, being mainly a northern species, can occur in Canada too.
Maybe the key in Vilgalys 1991 is useful, mentioning different cheilocystidia:
http://www.cybertruffle.org.uk/... ?

It fits Gymnopus ocior
By: Oluna & Adolf Ceska (aceska@telus.net)
2013-02-02 22:23:26 PST (-0800)

As you suggested, my collection fits Gymnopus ocior quite well. Vilgalys (1991, Table IV) gives 3 taxa of Gymnopus (sub Collybia) that have yellow gills: C. ocior subsp. ocior, C. alpina subsp. subsulphurea and C. earleae. According to Halling, Gymnopus earleae has gills pale-orangish-yellow only when young, becoming orangish-buff to ochraceous in mature specimens. From the remaining two taxa in the Vilgalys’ table, Gymnpopus ocior has a chestnut-brown cap, whereas in G. subsulphureus the cap is yellow. The problem is that G. ocior is a European species, whereas G.subsulphureus is so far known from eastern North America. See also our MO Observation # 96565, where we would also like to hear your opinion. – Oluna Ceska
Ref.: Vilgalys, R. 1991. Speciation and species concepts in the Collybia dryophila complex. Mycologia 83: 758-773.
Halling’s key: www.nybg.org/bsci/res/col/levipeds.html

Reminds me
By: Irene Andersson (irenea)
2013-02-01 00:03:03 PST (-0800)

of Gymnopus ocior (gills and stem more or less yellow, chestnut brown cap, typically fading in patches).
Isn’t subsulphureus supposed to have a yellow cap?

Created: 2011-03-04 06:00:43 PST (-0800)
Last modified: 2013-02-03 12:51:25 PST (-0800)
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