Observation 45159: Crepidotus mollis (Schaeff.) Staude
When: 2009-09-11
No herbarium specimen

Notes: Has a distinct gelatinous layer on upper side of pileus.

Dat.: Sept. 11. 2009
Lat.: 46.33486 Long.: 13.53015
Code: Bot_377/2009-3405

Habitat: Mixed woodland, cretaceous clastic rock (flysh), protected from direct rain by tree canopies, in full shade, humid place, average precipitations ~3.000 mm/year, average temperature 8-10 deg C, elevation 435 m (1.450 feet), alpine phytogeographical region.

Substratum: Debarked, heavily rotten log of a deciduous tree, probably Acer sp., Fraxinus excelsior or less probably Quercus.

Place: West of Bovec, near the trail to Plužna village, East Julian Alps, Posočje, Slovenia EC

Comment: Has a distinct gelatinous layer on upper side of pileus.

Ref.:

Nikon D70 / Nikkor Micro 105mm/f2.8

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight
Used references: (1) Personal communication with Mr. Anton Poler, Slovenia.
(2) A. Poler, Ed., Seznam Gliv Slovenie (in Slovene) (Check list of mushrooms of Slovenia), Assoc. of Mycological Societies of Slovenia (1998), p 22
(3) M.Bon, Pareys Buch der Pilze, Kosmos (2005), p 244
(4) D.Arora, Mushrooms Demystified, Ten Speed Press, Berkeley (1986), p 406
(5) http://www.grzyby.pl/gatunki/Crepidotus_mollis.htm

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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By: Irene Andersson (irenea)
2010-05-05 12:10:06 CDT (-0400)

Interesting discussion in Hesler & Smith’s description of mollis where several other species were reduced to mollis (haerens, fulvotomentosus, calolepis, calolepidoides).
Although brownish, incrusted hyphae may not always be diagnostic for mollis, I suspect that we could have other overlooked species with some kind of gelatinous cap cuticle in Europe too.
The particular character with the brown hyphae hasn’t been mentioned in any of my books, only the gelatinous layer that has lead to either mollis or calolepis.
This makes me wonder if we are dealing with several closely related species, or one with many various forms.. I’ll surely take a closer look at them in the future.

Again not sure…
By: Douglas Smith (douglas)
2010-05-05 08:28:26 CDT (-0400)

Actually, I’ve gone through the descriptions, and there isn’t enough there to really tell the difference as far as I’m concerned, so I kinda just decided to just all the stuff Crepidotus mollis, until I or someone can find enough difference to tell, but anyway.

All the stuff I’ve found and looked at has been in California, and on random hardwoods. Usually rotting logs, and not completely sure of which tree the log is from, but in random hardwood forests at the time. And the surface was glabrous and viscid. No scales going on. But encased in the viscid surface was the radial dark hyphae.

My most complete posted obs. can be seen here:

http://mushroomobserver.org/5602

And you can look up more info on North American Crep. here:

http://www.mykoweb.com/Crepidotus/index.html

Douglas,
By: Irene Andersson (irenea)
2010-05-05 07:41:33 CDT (-0400)

The description you gave, does it make any distinction between the varieties (var. mollis and var. calolepis), or does it include both?

What I have learned, is that var. calolepis has those brown fibrils (more like scales), while var. mollis is supposed to be glabrous or with scattered fibrils.

They are very closely related (if not the same species), but mollis is found particularly on Fraxinus and Fagus here. Var. calolepis is a more common form (and occurs further north too), rather frequent on aspen. Both forms have the same smooth, thickwalled spores, very dark brown in a spore print.
I have to admit that I haven’t done much work on them myself with the microscope, though.

Just for fun, I ran sequenses from GenBank between an american “mollis” and a swedish “calolepis” and they were a 100% match..

Not sure…
By: Douglas Smith (douglas)
2010-05-05 05:26:28 CDT (-0400)

Yes, C. mollis does have a thick gelatinous layer on the upper surface, but it also has distinct dark hyphae, more or less radially aligned, and embedded in the gelatinous layer.

If you can look at the spores, C. mollis spores are rather distinctive for a Crepidotus. smooth, ellipsoid, slightly pointed at the end. But the real distinctive thing, is the hyphae on the surface, are thick, textured without clamps. That with the spores really gives you the species here.

Created: 2010-05-05 04:38:58 CDT (-0400)
Last modified: 2010-05-05 04:39:00 CDT (-0400)
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