Observation 128247: Hygrophorus discoxanthus (Fr.) Rea
When: 2012-10-24
No herbarium specimen
0 Sequences

Proposed Names

-28% (1)
Recognized by sight: Found on a foray in a mixed, but mainly beech woodland in this park on the way to Avezzano.
47% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: walt sturgeon (Mycowalt)
2013-02-11 16:18:06 EST (-0500)
By: Gerhard Koller (Gerhard)
2013-02-11 14:37:27 EST (-0500)

that’s what I suspected. It seems here they do not agree with this treatment.

By: Irene Andersson (irenea)
2013-02-11 14:23:51 EST (-0500)

In Funga Nordica, H. quercetorum and H. eburneus var. quercetorum are synonyms to H. cossus. Species Fungorum agrees.. I used to call it quercetorum earlier.

By: Gerhard Koller (Gerhard)
2013-02-11 13:23:32 EST (-0500)

I cannot apply this situation to my “hunting grounds”. Here I have Hygrophorus eburneus var. quercetorum (almost staying white upon drying) and Hygrophorus discoxanthus (staining upon drying) and both with oak (the latter also with hornbeam) whereas in the more alpine regions we have H. eburneus and H. discoxanthus with beech. In Austria as far as I know H. cossus has never been found, my localities are predominated by oak and I have never seen that. All my findings that I formerly labelled as cossus turned out to be discoxanthus. I begin to doubt if there really is such a thing as cossus ss. str. … Some specimen of discoxanthus turn stronger yellow to black in dry state, some fainter. But who am I to decide?

With beech
By: Irene Andersson (irenea)
2013-02-11 13:09:46 EST (-0500)

you have eburneus and discoxanthus. According to my books, H. cossus grows with oak. They are all very slimy, but these could have dried up. If it’s not darkening on drying, it’s probably eburneus.

You’re welcome.
By: Gerhard Koller (Gerhard)
2013-02-11 12:44:39 EST (-0500)

Yes, it’s one of the characters but not the “real” relevant thing.
I suppose you have not seen it dried up?
H. cossus seemingly is a rare fungus that upon drying almost remains white whereas H. discoxanthus is very common and upon drying turns yellow-brown to almost blackish.

Thanks for the tip Gerhard!
By: James Baker (cepecity)
2013-02-11 12:31:13 EST (-0500)

Gerhard, This is my first encounter with either of these species. For H. cossus Mushroom Observer says “Specific oak association in Europe. Reported from conifer woods in North America. Also reported under beech in Great Britain.” EOL says that H. discoxanthus has association with broad leaf trees, and since this mushroom was found with beech it could be H. discoxanthus.

Are you aware
By: Gerhard Koller (Gerhard)
2013-02-10 16:08:58 EST (-0500)

of the difference between H. cossus and H. discoxanthus?

Created: 2013-02-10 16:07:25 EST (-0500)
Last modified: 2013-02-12 17:20:58 EST (-0500)
Viewed: 89 times, last viewed: 2017-06-15 10:34:56 EDT (-0400)
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