Observation 163344: Mycena pura (Pers.) P. Kumm.
When: 2014-04-11

Notes: Growing on humus in mixed woods.
Caps up to 2.3 cm across.
Spore print was white and spores were not amyloid.
Spores ~ 5.4-7.0 X 3.0-3.8 microns, oblong(Q ave = 1.87) and smooth.
Perhaps a Mycena?

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Recognized by sight

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Britney, thanks for the research..
By: Ron Pastorino (Ronpast)
2014-04-13 11:35:34 PDT (-0700)

it looks like we can’t even use routine DNA tests to nail down Mycena pura…

amyloid/inamyloid and Mycena
By: Britney Ramsey (Riverdweller)
2014-04-13 10:34:35 PDT (-0700)

“..Amyloidity is not diagnostic for species in the Mycena pearsoniana complex (Mycena sectio Calodontes)

Christoffer Bugge Harder, D. Jean Lodge, Ronald H. Petersen, Karen W. Hughes, Joaquin Cifuentes Blanco, Tobias Guldberg Frøslev, Thomas Læssøe
Mycological Progress (Impact Factor: 1.61). 11(3). DOI:10.1007/s11557-011-0782-x
ABSTRACT In Mycena sectio Calodontes with otherwise amyloid spores, the inamyloid spores of Mycena pearsoniana Dennis ex Singer were a distinguishing feature for this species and its subsection Violacella. Although the original concept of this species was European, Singer chose to typify it with material collected in Mexico. The name has since been applied to all European collections with inamyloid spores and decurrent lamellae. Our phylogenetic analysis of 91 ITS sequences from European, North and South American Calodontes collections shows that European collections identified as M. pearsoniana fall into two well-supported sibling clades together with both inamyloid and weakly amyloid North American collections. Since the holotype of M. pearsoniana is in an advanced state of decay, we have selected an epitype from a North American locality with a climate comparable to the Mexican type locality. Our results show weakly and inamyloid spore reactions to be homoplastic in Calodontes, and furthermore that spores of M. pearsoniana can show either amyloid or inamyloid reactions interchangeably. This raises doubt about the taxonomic value of this trait in Mycena systematics.

Mycena pearsoniana
By: Britney Ramsey (Riverdweller)
2014-04-13 10:23:12 PDT (-0700)

Has non amyloid spores. Wrong part of the world though?

Mycena pura was my first guess
By: Ron Pastorino (Ronpast)
2014-04-13 10:10:54 PDT (-0700)

but the spores, which do match in size, were not amyloid, as the photo indicates ?

Mycena pura
By: Britney Ramsey (Riverdweller)
2014-04-13 08:11:08 PDT (-0700)

This is a dead wringer for Mycena pura.

Created: 2014-04-13 08:03:09 PDT (-0700)
Last modified: 2014-04-13 10:37:03 PDT (-0700)
Viewed: 64 times, last viewed: 2016-10-21 10:19:57 PDT (-0700)
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