Growing in fairly deep duff near mixed woods.
Caps up to 9.2 cm across surface.
Brown edges on gills.


Gill edge

Proposed Names

57% (1)
Recognized by sight
82% (1)
Based on chemical features: nrITS-LSU joined sequence; see comment.

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Thanks Rod,
By: Ron Pastorino (Ronpast)
2020-07-19 12:02:53 CDT (-0400)

Did not see that coming.

I love the image of the colored lamella edge cells.
By: R. E. Tulloss (ret)
2020-07-19 11:32:23 CDT (-0400)


We are processing hundreds of sequences from samples in the RET herbarium
By: R. E. Tulloss (ret)
2020-07-19 11:31:10 CDT (-0400)

This observation’s voucher yielded a 100% match for sp-NW04, which was originally known from the Pacific Northwest. I can certainly see how this would be called pachycolea. This is a close relative to the European umbrinolutea and the New Jersey provisional A. jakeslandingensis. Cool to have this from Marin County, Ron. Lovely photos, too.

Be safe.

Very best,


The voucher material for this observation has been accessioned in the Roosevelt herbarium.
By: R. E. Tulloss (ret)
2019-07-25 12:01:55 CDT (-0400)

We expect the material to be sampled for sequencing within 48 hours.

Very best,