Observation 97054: Agaricus endoxanthus Berk. & Broome
When: 2012-06-10
Herbarium specimen reported

Notes: Brown spores, extreme phenol odor, pinwheel appearance on cap, cap diameter roughly 5cm, brown gills when found, annulus present. These were growing in a shady spot under sea grapes, Coccoloba uvifera. It was just pure luck I photographed these yesterday morning because I went back to secure a specimen today and they have been reduced to pure wisps of their former selves. I do have samples however small they may be.

To my knowledge, this mushroom has not been identified within the contiguous United States but has been documented in Hawaii. It has also been documented in Australia.

I’m interested in hearing feedback as to the identity of this specimen. Taylor Lockwood has photographed them in Australia and said it looked like this.

Proposed Names

82% (1)
Eye3 Eyes3
Recognized by sight
Used references: Richard Kerrigan

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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just saw your nice Mycophile back page on this sp., Mary.
By: Debbie Viess (amanitarita)
2016-07-05 12:53:03 CDT (-0500)

and found this MO sighting.

David and I also saw this is Australia back in early April of this year, in a motel lawn in tropical Cairns. I never got a shot of it, and by the time I brought back a camera, it was completely wilted. Still, a unique cap, and obviously a phenolic Agaricus once picked.

So, this is a post experience, under the radar MO obsie, but I hate to put up an imageless obsie, so I won’t.

Why “endo” xanthus? Does the context turn yellow?

I will try and look up your article, Rick, but my membership in the MSA lapsed, and I won’t be able to see those old Mycologia issues unless your article is now in open access.

Yes, and…
By: Rick Kerrigan (rwkerrigan)
2012-06-11 20:53:03 CDT (-0500)

I agree with Mary’s ID. It’s a distinctive species, known from many places (outdoors in the subtropics; indoors further north). Mary’s is (to my knowledge) the first collection ‘from nature’ in the 49 states. It has also been collected indoors in Massachusetts, and it grows wild in the Caribbean.

I (and others) treat A. endoxanthus as a preferred synonym, as it is an older name. Jointly we have several DNA sequences, including from the type specimen of A. rotalis from Hawaii. There is more info in our paper: Kerrigan et al. Mycologia, 97(6), 2005, pp. 1292–1315.

By: Irene Andersson (irenea)
2012-06-11 14:50:17 CDT (-0500)

It wasn’t in Sweden, it was in Estland, but seen by swedish mycologists (not me)
Here’s their photo:

Pin wheel mushroom
By: Mary Smiley (ladyflyfsh)
2012-06-11 13:53:48 CDT (-0500)

Thanks Irene. Have you found this before or seen it in person? Did it look like this one?

Pin wheel mushroom
By: Irene Andersson (irenea)
2012-06-11 12:16:33 CDT (-0500)

What a nice obs! It has been found in Sweden too, in a greenhouse with tropical plants from all over the world… hard to tell its origin then.

Created: 2012-06-11 10:53:00 CDT (-0500)
Last modified: 2012-06-11 21:12:27 CDT (-0500)
Viewed: 305 times, last viewed: 2016-10-21 17:15:41 CDT (-0500)
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