Observation 32770: Dendrocollybia racemosa (Pers.) R.H. Petersen & Redhead

Species Lists



Proposed Names

26% (3)
Recognized by sight: here it is again, growing on rotten lactarius. more mature. some on dryer, some left to mature further. thanks to Curecat for checking the nasty rotten mushrooms!
63% (3)
Recognized by sight: Blackish sclerotium – see A revision of Collybia website by Roy Halling

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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visual evidence for this sclerotium being D. racemosa is compelling…
By: Debbie Viess (amanitarita)
2011-12-18 09:18:13 PST (-0800)

see this species with very similar black sclerotium attached in this posting by Noah:


Someday, we might even have DNA confirmation as well. ;)

can we really be certain…
By: Debbie Viess (amanitarita)
2011-01-04 08:14:11 PST (-0800)

that these sclerotia will grow up to be Dendrocollybia? If not, our ID should probably reflect that uncertainty.

no need to;
By: Noah Siegel (Noah)
2010-12-28 18:42:16 PST (-0800)

you are old… it’s a small mushroom… was off trail… can’t think of any more insults atm.

bettah get up early, Noah…;)
By: Debbie Viess (amanitarita)
2010-12-28 18:39:18 PST (-0800)
I know
By: Noah Siegel (Noah)
2010-12-28 18:30:26 PST (-0800)

right where this and Erin’s ( http://mushroomobserver.org/32384?q=3BRX ) came from and will check to see if any Dendro’s are there…

Good idea
By: Christian (Christian Schwarz)
2010-12-28 17:07:34 PST (-0800)

Darv – I was just thinking the same thing about this observation today and support your suggestion.

The shape, texture, and eventual color seems about right.

Now the trick is to leave them in place and see if you find D. racemosa in the area.

could be, Darv…
By: Debbie Viess (amanitarita)
2010-12-28 15:20:09 PST (-0800)

especially since Dendrocollybia is supposed to grow “on” Lactarius species, altho it looks more like the sclerotium is created from a Lactarius substrate, and then grows from the ground.

How would one really prove that this black sclerotium is Dendrocollybia, tho? Aren’t there other mushrooms that form sclerotia?

Not a bad theory, tho!

By: Michael W (Michael Wallace)
2010-02-02 18:09:31 PST (-0800)

Darv had a good suggestion of Collybia tuberosa with his observation of what is presumably the same thing, how about the sclerotia of C. cookei.

Plant them
By: Darvin DeShazer (darv)
2010-02-02 10:46:45 PST (-0800)

I assumed the mushroom would rot and fall to the ground, gills down. So, I planted it in my backyard in the dirt, gills down. Time will tell if a basidiomycete fruits from the gooey mess.

just viewed Darvin’s post of this same critter…
By: Debbie Viess (amanitarita)
2010-02-02 10:09:42 PST (-0800)

and the sclerotium theory makes sense. ID will not be easily obtained at home, tho, without even a spore to go on.

this “fungus” is developing in a curious manner.
By: Debbie Viess (amanitarita)
2010-01-29 21:57:42 PST (-0800)

the little white balls have darkened and formed a brittle but tough exterior, soft interior, similar in some ways to a truffle. inner “spore mass” still white and undeveloped.

Balls can be extracted easily from rotten Lactarius substrate. will let mature, and then look inside them again.

Created: 2010-01-26 16:03:47 PST (-0800)
Last modified: 2011-12-18 09:25:57 PST (-0800)
Viewed: 276 times, last viewed: 2017-06-06 15:24:44 PDT (-0700)
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