On bark of a fallen branch of a deciduous tree, in a small forest of mostly oaks. Stems inserted into the substrate, nothing fancy at the stem base. The collection had three mushrooms, one mature (in the photo), with the cap 2.5 mm across and the stem 10 mm long.

No reaction at all in Melzers. No obvious hypoderm of inflated cells. It’s a Heminycena then (section Hirsutae), but it doesn’t fit the description of any species shown in Antonin & Noordeloos monograph. The closest seems to be Hemimycena angustispora, which has arcuate gills, hairs at the stem base, larger and narrower spores, and no hymenial cystidia.

Mycena setulosa seems a much better match, but it’s a poorly known species, with (according to Mycoportal) only one collection (from NC, Macon Co.) in addition to A H Smith’s type collection from GSMNP. The species is not mentioned in Maas Geesteranus’s “Conspectus”. Singer lists it as a Hemimycena in “The Agaricales”.

Smith recorded abundant fusiform cheilo- and pleurocystidia, and this is the only discrepancy with what I’ve observed. The cheilocystidia I saw looked cylindrical (see photos), but I didn’t manage to separate them and see their bottom part. And I didn’t look for pleurocystidia at all. (Need to work a little more, obviously.)

Species Lists


Pilocystidia, in Melzer’s. Up to 100 microns long. Spores 6.5-8.5 × 3-3.5.
Basidia 4-spored, 15-23 × 5. Cheilocystidia at bottom left. They could be pleurocystidia too.
Cheilocystidia, a band.
Caulocystidia. The one on the right was exceptionally long, 125 microns.

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Created: 2017-06-02 08:44:37 CEST (+0200)
Last modified: 2019-02-06 07:33:43 CET (+0100)
Viewed: 59 times, last viewed: 2019-08-22 21:04:57 CEST (+0200)
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