Published: N. Amer. Fl. 10 (3): 225 (1917)
Taxonomic status: This is a Inocybe.
Notes: Current name: Inocybe dryophila (Murrill) Beker & U. Eberh., comb. prov.
Types: UNITED STATES: California: Stanford University (approx. 37.4244°N, 122.1664°W, alt. approx. 35 m a.s.l.) on litter under Quercus sp., 14 Dec. 1901, C.F. Baker (CFB140), det: W.A. Murrill (Holotype. herbarium acc. no. NY 814863, HJB1000280; Isotype. herbarium acc. no. WTU-F-039664, HJB1000349).
Diagnosis: Pileus rather thin, convex to expanded, somewhat umbonate or gibbous, solitary, 2-2.5 cm. broad; surface viscid, glabrous, smooth, cream-colored, darker on the disk, margin entire, concolorous; context white, without characteristic odor or taste; lamellae Sinuate, rather crowded, broad, dark-cream-colored to subfulvous; spores ellipsoid, smooth, melleous under the microscope, 8-9 X 5-6 μ; stipe slightly enlarged at the base, fleshy, white, smooth, finely fibrillose below, 4-5.5 cm. long, 4-6 mm. thick.
Commentary: A herbarium note written by L.R. Hesler in 1972 suggests that this is an Inocybe. Our analyses support this view. The spores are ellipsoid to amygdaloid, some ovoid (8.5–10 × 4.5–5.0 µm); the cystidia, both cheilocystidia and pleurocystidia are ventricose often with apical crystals. An ITS sequence was generated from the holotype, which suggests that I. dryophila is a member of the I. geophylla group. It clusters there in a well-supported clade, not named by Matheny and Swenie (2018) who included an even larger selection of sequences from this clade in their analysis. Given the age of the name, I. dryophila may well be the correct name for the species represented by this clade.
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