Tricholoma myomyces var. cystidiotum
Mycologia 88(3): 503-504. 1996.
Common Name: none
Misapplied name: Tricholoma terreum
Cap 1.5-4.5 cm broad, convex, plano-convex to plano-depressed, the disc often slightly elevated; margin incurved in youth, wavy, with adhering pallid fibrils, eventually decurved to upturned in age; surface felty-tomentose becomingly squamulose, dark grey to blackish over a pallid background, the margin lighter; flesh thin, grey; odor mild; taste of cucumber.
Gills abruptly adnexed to sinuate, close, moderately broad, pale-grey, pallid in age.
Stipe 1.5-5.0 cm tall, 5.0-8.0 mm thick, equal, solid at first, then developing a thin, hollow core at maturity; surface of apex with scattered scales, smooth to silky below, pallid when young, dingy, light-grey in age; partial veil fibrillose, evanescent, leaving remnants high on the stipe or on the young cap margin.
Spores 5.0-7.0 x 3.5-4.5 µm, elliptical in face-view, similar in profile, smooth, thin-walled, inamyloid; spore print white.
Scattered to gregarious under conifers in coastal forests; common with Pseudotsuga menziesii (Douglas fir); fruiting from fall to mid-winter.
Questionable. Though apparently edible and sometimes abundant, too little is known about this and related species to recommend it. Tricholoma pardinum, for example, which also has a grey, scaly cap, but is larger, is known to be toxic.
This diminutive member of the Tricholoma clan is recognized by a dark-grey to almost blackish, squamulose cap with contrasting pale margin, and sparse cortina-like veil. Traditionally it has been known as Tricholoma terreum in older field guides, but according to Shanks (1997), the latter, which lacks a veil, may not be present in California. Other small, grey Tricholomas include Tricholoma scalpturatum and Tricholoma moseri. Tricholoma scalpturatum has a lighter grey, less squamulose cap and strong farinaceous odor, while Tricholoma moseri is a montane, snowbank species with a mild odor, lacks a partial veil, and has larger spores.
Bessette, A.E., Bessette, A.R., Roody, W.C. & Trudell, S.A. (2013). Tricholomas of North America. University of Texas Press: Austin, TX. 208 p.
Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
Shanks, Kris M. (1994). A Sytematic Study of Tricholoma in California. Masters Thesis, San Franciso State University: San Francisco, CA. 207 p.
Shanks, Kris M. (1996). New species of Tricholoma from California and Oregon. Mycologia 88: 497-508. (Protologue)
Shanks, Kris M. (1997). The Agaricales (Gilled Fungi) of California. 11. Tricholomataceae II. Tricholoma. Mad River Press: Eureka, CA. 54 p.