Observation 83475: Mycena (Pers.) Roussel
When: 2011-11-26
Herbarium specimen reported

Notes: Found in Tualatin Hills Nature Park, under oaks, growing on a decorticated small branch.

Odor strongly alcaline.

Spores 7-8 × 3.5-4 microns. Basidia 2- and 4-spored.

The pileus has a separable pellicle. It’s visible in the first photo, and obvious in the photo of the specimen maimed after several preparation I made from it. The pellicle is a crucial diagnostic character, which puts this mushroom directly into subgenus Glutinipes in A.H.Smith’s monograph (1947). The subsequent key puts the mushroom (because of lignicolous habitat) into section Caespitosae, where it does not match anything closely (cheilocystidia differ etc).

Maas Geesteranus’s key to sections of Mycena leads to a dead end after we pass the tests: (1) lamelar edge NOT separable as an elastic-tough thread; (2) spores pip-shaped; (3) stipe not exuding milk; (4) pileus covered by separable pellicle; (5) cheilocystidia sessile or short-stalked; (6) lamellar edges concolorous with the sides.

Thus, I cannot give this Mycena even a section name.

Species Lists

Images

185683
185684
185685
185686
185687
185688
185689
185690
Lemellar edge, packed with cheilocystidia.
185691
Cheilocystidia
185692
Cheilocystidia
185693
Cheilocystidia
185694
Hyphae protruding from the lamellar edge.
185695
Caulocystidia
185696
Hyphae from the cortical layer of the stipe.
185697
A hypha from stipetipellis gone wild.

Proposed Names

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Recognized by sight

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Created: 2011-11-27 14:09:01 PST (-0800)
Last modified: 2013-03-05 23:55:50 PST (-0800)
Viewed: 68 times, last viewed: 2016-11-30 20:05:41 PST (-0800)
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