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The 4 versus 2 spored conundrum seems to rear its head every once in awhile.
For identification of Mycenas I am using Smith 1947 (North American Species of Mycena) and Maas Geesteranus 1992 (Mycenas of the Northern Hemisphere). They both have a long discussion about this species that is well summarized by Maas Geesteranus (1992) p. 225:
“It is obvious from the various records of algeriensis-like species that a much more comprehensive (and time-consuming) study is required to clear away the uncertainties.”
Smith mentioned occurrence of 2-spored and 4-spored basidia on the same sporocarps, hence the variation in the spore sizes.
Substrate is wood (sometimes buried in duff) and I have add another photo from Observatory Hill to this observation record. It is not so rare in our area and on Observatory Hill we see it every year.
The spore size for this collection is rather longer than listed here:
It should be noted that M. algeriensis is reported from Algeria and is considered rare even in Europe.
Also, the above reference notes wood being the direct substrate – is that the case for this collection?