Collection location: Menlo Park, San Mateo Co., California, USA [Click for map]
Saw this tight bunch in someone’s front yard downtown Palo Alto, in wood chips. I thought it was Hypholoma until I turned it over and looked at the gills, which are light colored. Also the caps are very viscid.
With the darker colors at the base, and slight fuzziness, I’d call it this. First time I’ve seen these though…
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Redhead, S.A. & Petersen, R.H. (1999). New species, varieties and combinations in the genus Flammulina. Mycotaxon 71, 285-294.
Hughes, K. W., et al. (1999). Patterns of geographic speciation in the genus Flammulina based on sequences of the ribosomal ITS1-5.8S-ITS2 area. Mycologia 91: 978-986.
Methven, A. et al. (2000). Flammulina RFLP patterns identify species and show biogeographical patterns within species. Mycologia 92: 1064-1070.
Also see “The Genus Flammulina, a Tennessee Tutorial” at:
I’ve heard these have been being worked on either with mating studies or DNA. Not surprisingly there are multiple species, but I’m not sure what’s been published at this point. Anyone have any leads?