White tricholomatoid mushroom with a stipe, sinuate gill attachment, umbonate pileus, and roughened, amyoid spores (7.8-8.0 X 4.7-5.4), and dextrinoid hymenium. It’s about 10 cm tall. The stipe swells a little at the base but is pretty even. The pileus is about 5 cm across with an inrolled margin. It has no obvious cheilocystida, which seems odd for the genus. It does have a few pleurocystidia (see photo), but they are not very numerous. The gill trama is regular. Hyphae lack clamps. It has a slightly musty smell, and a moderately bad taste. The habitat was a site next to a ball field (watered),and there are some older Monterey pines, grass, and some Australian tree that I can’t remember. I wanted to call it a Leucopaxillus, but it should have had clamps and mycelium at the base. As I mentioned above Dennis Desjardin suggested the species name, and after looking up images and descriptions of it I think it fits pretty well.


Pleurocystidium with roughened apex.

Proposed Names

91% (2)
Recognized by sight: the scabrous stipe is pretty distinctive, had I known the species, but I cheated and emailed Dennis Desjardin who suggested the name. I’ve never seen this before.
Used references: Pacific NW key to Melanoleuca
Based on microscopic features: size 7.8-8 X 4.7-5.4 of the amyloid ornamented spores fits

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= Observer’s choice
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Nice find!
By: Christian (Christian Schwarz)
2011-06-29 18:16:05 PDT (-0700)