Described from Pasadena, California.
Original species description: https://www.biodiversitylibrary.org/...
They seem really close at least, I’m not entirely sure how to tell them apart. In the smith key, P. longipes is grouped with 3 other species, two (P. fragilissima & P. elwhaensis) have been made synonyms of P. marcescibilis. The third (P. thomii) has larger spores and could be something else, maybe obs 97004 & 65825 are it?
Smith distinguishes them in the key with “Spores somewhat compressed laterally.” vs “Spores terete in cross section.” along with mostly small differences in spore size, but I understand now that P. marcescibilis has spores that are variable in size & shape… He also fails to include P. marcescibilis in his key, although he does consider it the type of section Fragilissimae. P. marcescibilis is reported for the states and I am pretty sure obs 129954 is it.
Here is a good reference on Psathyrella marcescibilis.
I also looked at genbank, but I didn’t see any P. longipes sequences…
Created: 2007-01-09 23:03:43 CST (-0600) by Nathan Wilson (nathan)
Last modified: 2019-03-23 14:50:59 CDT (-0500) by Alan Rockefeller (Alan Rockefeller)
Viewed: 1109 times, last viewed: 2020-09-16 15:42:11 CDT (-0500)