Observation 83568: Tricholoma myomyces (Pers.) J.E. Lange
When: 2011-11-27
No herbarium specimen

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In his North American field guide
By: Dave W (Dave W)
2011-12-01 09:41:21 CST (-0600)

Phillips lists T. terreum AND two varieties of T. myomyces, where the myomyces types may be separated according to spore size. The two myomyces types are listed as having much different spore l/w quotients.

The spores observed in the obs seen here appeared to be on the small side, with some lengths smaller than 5 and the longest ones topping out at maybe 6.5.

Confusion
By: Drew Parker (mycotrope)
2011-12-01 09:22:16 CST (-0600)

The T. myomyces/terreum conundrum is very confusing and contradictions abound. These are two European species which may or may not be the same as what we find in North America. Currently Index Fungorum synonymizes them under the name terreum (is this a reversal?) as do some European mycologists. But terreum is deprecated here on MO on the basis of Index Fungorum?!?. Mycobank recognizes both names but comments in detail about why it’s impossible to differentiate them (veil included). Seems to me that for convenience we should go along with the Europeans and use the name terreum for this group. At least work on North American Tricholoma is underway. Yeah, staying tuned is about all we can do.

Synonyms
By: walt sturgeon (Mycowalt)
2011-11-28 23:31:57 CST (-0600)

The veil is not always visible. For now they are synonyms. But stay tuned…

I had planned to post this obs
By: Dave W (Dave W)
2011-11-28 19:50:32 CST (-0600)

as a split “promising” decision… between T. myomyces and T. terreum, based upon my not knowing if there had been a partial veil. But “Tricholoma terreum” is depreciated. Is there a reason for this? Just read Arora’s account a few minutes ago, and he uses the label “Tricholoma terreum group”. He mentions T. myomyces as one of the species within this group.

Created: 2011-11-28 19:46:07 CST (-0600)
Last modified: 2011-11-28 19:46:08 CST (-0600)
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