Notes:
I thought at first that this was just another Coprinus comatus but it lacks some of the key defining characters of that taxon: no loose hyphal strand in the stem, no ring, gills first white then black without a pink stage and apparently not liquefying. And unlike C. comatus it has a very tough persistent partial veil which is firmly attached to the stem, gill edges and cap margin so that the gills are not exposed. Is this a secotioid species, perhaps a secotioid form of C. comatus or something related?

Grassy soil with introduced trees—loosely attached to the soil, not sign of wood. Temps 70 day/50 night, 3200’ elevation.

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C comatus
By: Terri Clements/Donna Fulton (pinonbistro)
2018-09-21 11:42:42 CDT (-0500)

may be a species complex. And mushrooms do funny things in AZ due to arid conditions and high elevation sun exposure. Run this ITS sequence against Coprinopsis atramentaria and you will see they are not at all similar: https://blast.ncbi.nlm.nih.gov/Blast.cgi

DNA sequence
By: Peter Vahlberg (Pdvmushroom)
2018-09-21 11:11:48 CDT (-0500)

This mushroom doesn’t visually fit Coprinus comatus in any way, but all the closest matches in the BLAST search are in Coprinus. Either this is a really abnormal Coprinus comatus, or the DNA sequence isn’t right somehow. Maybe it has really similar DNA? Since there were at least three specimens that looked relatively the same, an abnormal C. comatus doesn’t seem likely. Any other thoughts? This one is pretty confusing.

Sure looks like it I agree.
By: Terri Clements/Donna Fulton (pinonbistro)
2018-09-21 10:37:11 CDT (-0500)
The problem is it is not closely related to Coprinopsis spp. Blast the ITS sequence and you will find that it is clearly Coprinus comatus group.
Coprinopsis atrementaria/romagnesiana
By: Peter Vahlberg (Pdvmushroom)
2018-09-20 20:57:13 CDT (-0500)

I’m pretty sure that this is in the Coprinopsis atrementaria group. The scaly cap suggests Coprinopsis romagnesiana, which has scales and often small blackish scales on the stipe when mature. If you look closely at some of the pictures you can see the black scales on the stipe. I think that the scales on the top of the mushroom come from being dry. The “partial veil” covering the gills are actually a bunch of microscopic cells that are on the edges of gills, which I have commonly found on Coprinopsis romagnesiana. In the end I’d stick with C. romagnesiana as an ID.

Thanks for the suggestion Jacob
By: Terri Clements/Donna Fulton (pinonbistro)
2017-11-06 13:36:13 CST (-0600)

It sure looks like it but what about the tenacious partial veil attached to/covering the gills?

Created: 2017-11-05 17:32:22 CST (-0600)
Last modified: 2018-11-08 12:27:45 CST (-0600)
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