Observation 82751: Agaricus californicus Peck

When: 2011-11-13

Collection location: Ukiah, California, USA [Click for map]

Who: Len (placeport)

No specimen available

I found these Agaricus in Ukiah but I could not positively ID them. They look a bit like A. californicus but they do not stain yellow on cutting, bruising, OR with a drop of KOH on the cap. They have not much smell, but I’m not the greatest nose around. I suppose they could have a very faint phenol scent but i wasn’t sure. They did not smell almondy. They were growing in grass. The gills are not pink,but kind of whitish to buff. A fellow observer from BAMS suggested A. Californicus. Another suggested A. arvensis due to the cogwheel pattern evident in the ring. I also wondered if they may be A. hondensis.

What throws me off is the negative KOH reaction. Arora 1 states that A.
californicus stains yellow with KOH. He also mentions another variant
that does not yellow easily. Also the gills of A. californicus are
usually pink when the cap opens, whereas these specimens were whitish to
light tan-gilled, never pink or rosy. Anyway as of 11/17/2011 at 8:45 pm I still have them in an icebox so if anyone has another test, please advise!

See also message thread at http://tech.groups.yahoo.com/...

Proposed Names

27% (1)
Used references: 1 Arora D. 1986. Mushrooms Demystified: A Comprehensive Guide to the
Fleshy Fungi (2nd edition). Berkeley: Ten Speed Press.
55% (1)
Recognized by sight: grass dwelling, toxic Agaricus sp.; sometimes does not yellow, even when base if bruised or cut.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
other possibilites…
By: Debbie Viess (amanitarita)
2011-11-18 08:59:05 MST (-0700)

Hondensis is a similar woodland sp. Arvensis would be showing yellow, lots of yellow, by now, and smell almondy. Most all of these sp. show slightly pinkish gills when young, so maybe this is something else? Odds are that it is one of the barficus group, though.

Created: 2011-11-17 21:46:44 MST (-0700)
Last modified: 2011-11-18 08:58:14 MST (-0700)
Viewed: 73 times, last viewed: 2017-06-10 01:48:27 MST (-0700)
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