Collection location: Sebastopol, Sonoma Co., California, USA [Click for map]
Spores 7-9 um, amyloid with small warts.
Cheilocystidia septate with a dot in the middle of the septum and some with Inocybe type encrusted crystals on the apex.
Very similar or the same as M. utahensis. Mycologia 69: 927-951. However, the key and description lacks the clarity of Bas, et al.
Bas, C., TH. W. Kuyper, M. E. Noordeloos and E. C. Vellinga. 1999. Flora Agaricina Neerlandica: Critical Monographs on Families of Agarics and Boleti Occurring in the Netherlands. Volume 4: Strophariaceae, Tricholomataceae (3). A. A. Balkema, Rotterdam, Netherlands. 191p.
Gillman, L. S. and O. K. Miller. 1977. A Study of the Boral, Alpine and Arctic Species of Melanoleuca. Mycologia 69: 927-951.
Hanson, Lise and Henning Knudsen. 1992. Nordic Macromycetes Vol. 2: Polyporales, Boletales, Agaricales, Russulales. Nordsvamp Pub., Copenhagen, Denmark. 474p.
I have reached the same conclusion regarding the id — my collection was on 2007-11-20.
Considering htat the Genus is in a dire need of a complete rewrite, the sources available to me, plus the microsocpy suggested strongly M. exscissa. I see the same septate cystidia.
Now on to the other Melanoleuca spp.