Observation 268176: Pluteus Fr.

When: 2016-11-25

Collection location: Lake Hennessey, Napa Co., California, USA [Click for map]

Who: Pgrunow

No specimen available

unfortunately, this is the only picture that came out, but thought I may as well post anyways.
on a grassy hill under mixed oak woods

Smoky gray cap, becoming substantially lighter toward the whitish, bright translucent-striate margin. Gills creamy white. No odor. To me, I see a faint bluish tint to the cool gray stipe, which is curved and subtly larger at the base, but I that may be arguable. Live oak associated, not with conifers or wood chips.
All surfaces were smooth and dry. Phaeocyanopus is possible with the habitat and appearance, but may be too dark for this mushroom, as it would probably be a younger one given the pale, less blue stipe. The stipe tones and small size is making me lean toward the nanus group. I know that genetically the “nanus” here is distinctive from old world nanus types. In Eurasia, nanus can grow with quercus, but I don’t know if that is the case with California specimens of the Nanus group. According to the 12 new species of holarctic pluteus section pluteus paper, americanus and salicinus are not known from here. The other possibility I am aware about would be the pluteus thomsonii group. What little I have found about thomsonii does not match the photograph so well.


Proposed Names

61% (2)
Recognized by sight
-86% (1)
Recognized by sight: had thought about this but probably not
29% (1)
Recognized by sight: See notes
Used references: Mushroom Observer, Mushrooms of the Redwood Coast, 12 new species of pluteus section pluteus from the holarctic

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= Observer’s choice
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Add Comment
okay thank you
By: Pgrunow
2017-01-25 00:51:17 CST (-0500)

it looks thicker looking at it now than i remembered but I should have spent more time with it.

Bolbitius ~reticulatus
By: Jacob Kalichman (Pulk)
2017-01-25 00:44:12 CST (-0500)

cap should be thinner and/or more viscid and/or more plicate/striate, and stem should be more textured