Observation 21864: Entoloma Fr. ex P. Kumm.

Collection and macrophotography by Dan Molter.
Same collection as M.O. #21378:


Pileipellis a cutis with many clavate, inflated elements transitioning to a trichoderm or hymeniderm. Clamps extremely obscure or rare. Only one found. This suggests Section Cyanula, despite the squamulose and umbonate pileus. Pigment strictly intracellular and brownish in saturated salt solution.

Spores strongly 5-7 angled, heterodiametric, 8.6-10.5 microns long, 6.2-8.6 microns wide, 9.3 × 7.0 microns (avg). Thick walled and with a central oil droplet.

Cheilocystidia interspersed with basidia at margin of lamellae, clyindrical-clavate to irregularly contorted or with constriction to appear weakly lageniform. Significantly larger than basidia.

Basidia 4-spored.

Terrestrial species:
E. allochroum has somewhat coralloid, multiseptate cheilocystidia, generally larger spores (although these are just below or at the low end of the range), incrusting and intracellular pigment in the pileipellis, differently shaped terminal elements in the pileipellis, and abundant clamps in the pileipellis.
E. dichroum has somewhat larger spores, septate cheilocystidia, and uninflated elements in the pileipellis with abundant clamp connections.
E. nigroviolaceum has a pileipellis very similar to this collection, also lacks clamps, but also lacks cheilocystidia. The spores are a bit larger.

Lignicolous species:
E. euchroum grows on wood and is distinctly violaceous-blue, and has a strong flowery smell, the spore size is a very good match with this collection. However, it rarely has a small papilla, and is often umbilicate. Also, there are more clamps in the pileipellis and no inflated elements.

[admin – Sat Aug 14 02:03:49 +0000 2010]: Changed location name from ‘North Bend State Park, Ritchie CO., West Virginia, USA’ to ‘North Bend State Park, Ritchie Co., West Virginia, USA


Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz

Proposed Names

60% (2)
Eye3 Eyes3
Recognized by sight
Used references: Entoloma (Agaricales) in Europe (Noordeloos, 1987), Entoloma in North America, (Noordeloos 1988), Entolomatoid Fungi of the Western United States and Alaska (Largent, 1994)
Based on microscopic features
45% (2)
Recognized by sight: Seems the closest match

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
probably terestrial
By: Dan Molter (shroomydan)
2009-06-08 19:25:18 CDT (-0400)

Whether or not it was growing from the bottom of the log or from ground under the log is hard to say. It let go really easy when I plucked it. Probably terrestrial.

Looks terrestrial to me
By: Paul Derbyshire (Twizzler)
2009-06-08 19:20:42 CDT (-0400)

The one in photo 46304 appears to be growing beside, rather than on, the log.

By: Christian (Christian Schwarz)
2009-06-08 19:17:45 CDT (-0400)

Without some really in-depth work with Eastern literature, I don’t know for sure.
I thought that such a distinctive little guy would turn up pretty easily, but that’s Entoloma for you.

To clear things up, was this collection terrestrial or lignicolous?

sweet microphotos and drawings!
By: Dan Molter (shroomydan)
2009-06-08 17:55:38 CDT (-0400)

So what species name should go on this guy?

Created: 2009-06-08 13:26:10 CDT (-0400)
Last modified: 2012-01-02 14:16:14 CST (-0500)
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