Observation 118294: Mycena hemisphaerica Peck
When: 2012-11-25
Herbarium specimen reported

Notes: A small group, growing on rotten wood between two alder logs that hosted M. galericulata (observation 118290), but probably not the same thing. These are much darker-colored, have smaller spores and no distinctive taste. But it’s in section Mycena: firm hollow stem, gills elastic-tough, cystidia as in M. galericulata.

Need more microscopy.

(Dec 4, 2012)

From the key in Maas G: M. hemisphaerica if “pileus blackish when young” and “spores 6 microns broad at the most”; M. galericulata if “pileus usually some shade of yellowish grey-brown even when young” and “spores broader than 6 microns”. He also suspects that the two might be the same species (page 98).

Now, the width of the 13 measured spores were 5,5,5,5,5,6,6,6,6,6,6,6.5,7 microns. The caps (esp. young ones) were very dark, more than the photos show.

Microscopically, the two species are hardly distinguishable; see Aronsen’s table in http://home.online.no/~araronse/Mycenakey/galericulata.htm. I found no caulocystidia and a only a few diverticulate hyphae on the stipe. There were numerous branching hyphae in the pileipellis, not diverticulate.

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Created: 2012-11-29 02:51:38 CST (-0600)
Last modified: 2012-12-05 01:40:02 CST (-0600)
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