Notes: Growing from the (moss-covered) base of oak trees in Tualatin Hills Nature Park.
Spores 7-8 × 5-6 microns. Basidia 4-spored.
The match with the description of M. leptophylla in Maas Geesteranus is very good: habitat, spore size and shape, colors of cap and stem, etc. The only other candidate seems to be M. roseipallens, to which our collection would key out if A. H. Smith’s 1947 monograph is used. That is because Smith’s key uses the spore shape as the distinguishing character, and requires the spores of M. leptophylla to be sublobose, which is apparently too restrictive.
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Thanks, Irene. I also eliminated M. roseipalens with confidence: its cap is supposed to have a distinct pellicle.
I’m pretty sure you got the right ID. The blackening stipe should be diagnostic as well. I looked up a description of roseipallens, and its cap was said to be rather fading than darkening in the middle as in leptophylla.
Created: 2011-11-27 03:37:04 PST (-0800)
Last modified: 2013-03-05 23:56:32 PST (-0800)
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