Observation 172589: Agaricus comtulus Fr.

When: 2014-08-04

Collection location: Steven Kent Winery, Livermore, California, USA [Click for map]

Who: Debbie Viess (amanitarita)

No specimen available

This is the second sighting this week of this rare lawn dweller. Alas, no photo, and somehow I threw out the collection that I made when I returned home from the winery… and despite tearing apart my trash cans, I haven’t been able to relocate it. Darn it. Two disparate locations in a handful of days no doubt means that it is up in many other places right now, too. Keep an eye out for it, and put up your obsies here on MO. Let’s see just where that mycelia lurks, waiting for that fruiting opportunity. Tis the season.

Original MO obsie: http://mushroomobserver.org/172202?q=27Cko


one cap found in upper layers of recycling bin; a bit the worse for wear.
one cap found in upper layers of recycling bin; a bit the worse for wear.
one cap found in upper layers of recycling bin; a bit the worse for wear.
in KOH from spore-drop, 1000×.
pilipelis in water, 400×. note yellow coloration.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight: small white Agaricus that slowly yellows on cap, ephemeral annulus, fragile stipe of uniform thickness.
Based on chemical features: faint anise odor.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
got photos?
By: Debbie Viess (amanitarita)
2014-08-06 15:50:54 PDT (-0700)

put ’em up!

I may have seen them before and just assumed that they were something else. now, of course, Ill see them everywhere! It is odd that mine was the first photo record here though.

Sebastopol occurrence.
By: REV0 (REV0#kadavur)
2014-08-06 11:57:17 PDT (-0700)

Definitely plenty of those here in our orchard, nearly through out the year when the fog is in favor. We also have them growing in our bamboo gardens.

just did the micro …
By: Debbie Viess (amanitarita)
2014-08-06 11:03:19 PDT (-0700)

spores a bit large for comptulus: 6 × 5, 6 × 4.5, 6 × 5, 7 × 6, 7 × 5. Was selecting for largest, darkest spores on my slide (just Giant Spores?). The entire cap collapsed due to fevered overnight maggot activity, so hard to tell if it was spore drop or just spore collapse!

Some uncolored spores were a good bit smaller. Still, the macro/timing/location is still a best fit to comptulus/comtulus.

Fred Stevens, our CA Agaricus expert, claims that it is rare in the BA, and a complete lack of MO obsies for this species, prior to last week, lends credence to that claim. Arora calls it “common.” Maybe folks just don’t pick those small white yellowing Agaricus from lawns, thinking that they are just barficus?

Now’s the time to look for these things in lawns, and document. Once you look hard, they are quite distinctive.

found one.
By: Debbie Viess (amanitarita)
2014-08-05 21:00:06 PDT (-0700)

they got dumped in recycling with paper that I had lining my basket. Couldn’t reach the very bottom of the deep can, but did find one already spore producing cap in the upper layers of papers.

I wish.
By: Debbie Viess (amanitarita)
2014-08-05 13:57:09 PDT (-0700)

No camera at the event yesterday, and I inadvertently threw out my photo-worthy collection after I got home. BUT! I searched the bottom of my basket and found a lone, just starting to color the gills cap. It/I am attempting a spore print as I type, and I can photograph that, as well as any micro, when it’s done.

They looked and smelled just like the Yuba City collection from last week, if that’s any help, for now!

Yeah, I hate to put up an un-photo-backed obsie. But I do have morpho details, several witnesses, and god willing, some micro in a day or so.

Can’t win ’em all! :)

By: Byrain
2014-08-05 13:18:16 PDT (-0700)

Created: 2014-08-05 11:18:42 PDT (-0700)
Last modified: 2014-08-06 10:55:36 PDT (-0700)
Viewed: 61 times, last viewed: 2017-11-11 14:11:00 PST (-0800)
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