Observation 131741: Leratiomyces percevalii (Berk. & Broome) Bridge & Spooner
When: 2013-04-09
No herbarium specimen

Notes: Stropharia, but which species?
Substrate: rich soil with wood chips. At least some actually growing on wood. See LH specimen in third image (image 321951)
Cap: Not viscid, but that is may have been washed/blown away; diameter up to 4 cm. on collected specimens, but much wider on older, uncollected ones. See 2nd image (image 321950)
Stem: 6 cm tall; 0.8 cm diameter
Lacks the decoration you’d find on S. ambigua (but that also likely washed/blown away), and the stem is not tapered.
Seems like the wrong shape for S. coronilla and also lacking any ring. Cf. PNWKC Key to Strophariaceae
Does not taper downward like S. riparia.
Cap colors not quite right initially or in age for S. albonitens, which is also rare in Pacific NW.
If you suggest or vote on a name, I would appreciate your commenting on your reasons for the suggestion/vote.

Proposed Names

85% (1)
Eyes3
Recognized by sight: This is the taxon that we have been calling Stropharia riparia for many years. It is extremely common on the west coast in wood chips in the spring. The actual Stropharia riparia grows with aspen. I wouldn’t put a whole lot of emphasis on tapering downward.
28% (1)
Eye3
Used references: See the Notes on Taxonomy for Stropharia riparia, which suggests that S. riparia is a distinct N. American taxon, rather than Leratiomyces percevalii.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thank you Alan.
By: Joe Cohen (Joseph D. Cohen)
2013-04-12 23:26:09 WIB (+0700)

Alan:
Thank you for the help.
The identification is new to many (or perhaps all) of us in Oregon, though the mushroom is not. This is the first MO observation of this taxon in Oregon. (There are no MO Oregon observations of S. riparia.) I — for one — have probably misidentified this in the past as S. ambigua. See observation 130780 (which I will now re-name.)
(Also, FWIW I notice, on further reflection, that (1) none of the mushrooms, including the old ones in the 2nd image (image 321950) is as tall as S. ambigua normally gets, and (2) some of the uncollected specimens do have veil remnants on the edge of the cap and white scales on the stem. See 3 mushrooms in the RH side of the 1st image (image 321949).)
- Joe

Created: 2013-04-12 10:02:06 WIB (+0700)
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