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Observation 11058: Cystoderma Fayod

When: 2008-09-10

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

Who: Paul Derbyshire (Twizzler)

No specimen available

Scaly stem, projections on cap margin — but no ring? Color change on upper stem though. Something with a partial veil, then.

Field guide is little help here.

In one small area (fourth photo) there were at least six of these and at least two of the mushrooms in obs. 11059.

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Add Comment
By: Paul Derbyshire (Twizzler)
2008-09-14 17:50:26 CDT (-0400)

No scales on cap seems to eliminate C. amianthinum. Closest matches for stem appearance in my field guide are Cystoderma, Armillaria, Pholiota, and friends. Non-wood habitat seems to make the latter unlikely.

By: Daniel B. Wheeler (Tuberale)
2008-09-14 16:51:07 CDT (-0400)

I had keyed this out to the Cystoderma genus, but couldn’t get further. In researching C. amianthinum, I had to reject that name because the description in Helene M.E. Schalkwijk-Barendsen’s Mushrooms of Northwest North America states “stalk: base same as cap, paler or the same clour above the ring; up to 6 cm taql and 0.5 cm thick.” The problem I have is the color of the stalk base being the same as the cap. I don’t see it. The original collection notes say nothing about what might have caused the extreme darkness on the base of the stem, so must trust my eyes, and say this may be a new species of Cystoderma.