Observation 136971: Marasmiellus subnigricans (Murrill) Singer

When: 2013-06-12

Collection location: Big Thicket, Polk Co., Texas, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

These were growing on a large branch or small log in the Big Sandy Creek Unit.
Caps were up to 4.5 cm across and the stems up to 4.2 cm long.
Spore print was white, turning light yellow with age.
Spores were not amyloid, and ~ 10.9-12.0 X 4.2-5.1 microns and tear-shaped.
Although M. candidus appears to be the preferred synonym for M. albuscorticis, I prefer to use the local term from “Texas Mushrooms”
David Lewis thought thinks they are M. albuscorticis also.
They seem to me to be quite different from what we call M. candidus on the west coast, in spite of the fact the spores are the same size.
These have larger caps and longer stems and the stems are all white…no black.
The stems were also partially hollow.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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A picture
By: Christine Braaten (wintersbefore)
2013-06-30 14:59:04 PDT (-0700)
By: Christine Braaten (wintersbefore)
2013-06-21 20:07:50 PDT (-0700)

Mine darkened after drying, dark reddish brown. I’ve saved the collections. I’ll get a photograph so that others can see what its supposed to look like after drying.

Thanks Christine,
By: Ron Pastorino (Ronpast)
2013-06-21 19:30:44 PDT (-0700)

I’ll try to get that reference and compare it to the Murrill and one that is from Indonesia.
Unfortunately I didn’t dry them or save them so right now it all conjecture.
Your material does look quite similar and am wondering if you noted the blackening after drying?

By: Christine Braaten (wintersbefore)
2013-06-21 18:40:26 PDT (-0700)

From Desjardin (1997) A synopsis of Marasmiellus in the Southern Appalachian Mountains. Mycotaxon LXV: 237-261
“Mamsmiellus subnigricans is closely allied with M. candidus and M. albofuscus (Be rk . & M. A. Curtis)Singer (the laner known only from Cuba; Singer, 1973), but differs in two significant features: a) the white basidiomes darken to nearly black when dried (less so when air dried) with thenecropigmemt soluble in 3% KOH; and b) the stipes arise from a subiculum-like mat of dense white mycelium that may be quite extensive over the surface of the woody substrate.”

There is a full description in Desjardin (1989) The genus Marasmius from the Southern Appalachian Mountains

By: Christine Braaten (wintersbefore)
2013-06-20 02:16:37 PDT (-0700)

I’ll post info on the reference, Desjardin’s literature I’m sure, I’ll find it. Not really at all sure if that’s what this is, if so, the gills will be covered in those apically encrusted cystidia (those are hard to miss), also, when you dry it, it will turn dark (sort of reddish brown- maybe that’s where the name subigricans came from?).

Thanks Christine
By: Ron Pastorino (Ronpast)
2013-06-19 19:04:31 PDT (-0700)

Even though I can’t find info on M. subnigricans, it certainly looks like what you have posted.
It’s more probable in my opinion than what I proposed and if you have a link to a description, it would be appreciated.

Created: 2013-06-19 16:50:41 PDT (-0700)
Last modified: 2013-06-19 18:55:11 PDT (-0700)
Viewed: 115 times, last viewed: 2017-06-16 01:08:58 PDT (-0700)
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