Observation 17361: Agaricus L.

When: 2009-01-22

Collection location: Caspar, Mendocino Co., California, USA [Click for map]

Who: Ryane Snow (snowmam)

No specimen available


[admin – Thu Feb 10 03:25:56 +0000 2011]: Changed location name from ‘Caspar, California, USA’ to ‘Caspar, Mendocino Co., California, USA’


Proposed Names

33% (5)
Recognized by sight: found in mixed conifer forest <1 mile from coast; sweet almondy odor; in middle of Winter!?
31% (4)
Recognized by sight
56% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
ironic that perobscurus was proposed…
By: Debbie Viess (amanitarita)
2009-01-25 09:11:15 MST (-0700)

after a former rather contentious debate about augustus in winter vs perobscurus on the MSSF list a few years ago. If you saw the mushroom in hand, and the colors were a warm brown, then I think that your ID should have precedence, barring further definitive microscopy work. Don’t you?

Perobscurus, as you noted, should have black or dark, brown-gray cap ornamentation, and its almondy odor (according to Arora) is often faint to absent.

Smithii is another almondy, warm brown species that can occur in the winter along the north coast, and one that I had mistakenly confused with perobscurus myself in that long ago debate…

Agaricus augustus
By: Ryane Snow (snowmam)
2009-01-24 23:24:11 MST (-0700)

Had it not had an almondy odor I would say it was A. subrutilescens. I ruled out A. perobscurus due to the fibrils in the cap being a warm brown to tawny color rather than dark brown or grayish brown. The photo was taken with flash and doesn’t give a true representation of the cap color.

Agaricus subrutilescens, I reckon…
By: Dimitar Bojantchev (dimitar)
2009-01-24 09:26:45 MST (-0700)

Ryane, the chocolate color of the pileus reminds me strongly of A. subrutilescens, which you guys in Mendocino are blessed with having in vast quantities. It’s a great edible too. Unless you’re absolutely convinced that it had a strong almond odor, I’d change the name to that. I’ll leave you to decide. Here are some photos of this one from Mendo.