Published: Mycologia 3 (4): 166 (1911)
Taxonomic status: This is a Agrocybe cf.
Notes: Current name: nom. nov. Agrocybe hesleri Watling, Kew Bull. 31(3): 593 (1977), non Agrocybe praecox (Pers.) Fayod (1889).
Types: UNITED STATES: New York: Bronx Co., New York Botanical Garden (approx. 40.8617°N, 73.8803°W, alt. approx. 30 m a.s.l.) on mossy soil, 20 Jun. 1910, W.A. Murrill (Holotype. herbarium acc. no. NY 814901, HJB1000295).
Diagnosis: Pileus convex 10 expanded, slightly umbonate, gregarious, 4-5 cm. broad; surface dry, glabrous, opaque, smooth, ochraceous-isabelline; margin incurved, entire or undulate, showing no trace of a veil; context white, sweet, odor pleasant; lamellae sinuate, arcuate, close, many times inserted, pallid when young, fulvous at maturity; spores ovoid, smooth, pale-ochraceous, not conspicuously nucleate, 5-6 X 3-4 μ; stipe fleshy, brittle, subequal, stuffed to hollow, finely scabrous, sometimes rough, cremeous, 3-4 cm. long, 5-8 mm. thick. Type collected among mosses on a shady bank in the New York Botanical Garden, June 20, 1910, by W. A. Murrill. Also collected again in the same spot, June 8, 1911. This is the first species of Hebeloma to appear in this localily. Although not at all viscid when found on either occasion, it might well become slightly so in wet weather. The remnants of the partial veil are left clinging to the stipe as the expansion of the pileus progresses, leaving none on the margin.
Commentary: The spores are small, thick-walled and smooth, without a clear germ pore (5–7 × 3.5–4.5 µm). The cheilocystidia and pleurocystidia are clavate, sometimes utriform. None of the Agrocybe (or Cyclocybe) species, for which sequence data have been published to date, have spores this small. Given the confusion around the genus limits of Agrocybe, and the current lack of genetic markers from single copy genes for many species that might lend support to family limits between Hymenogastraceae and Strophariaceae, we hesitate to subscribe to Watling’s recombination of this species into Agrocybe, but we cannot offer another suggestion. Unfortunately, we were unable to generate any DNA sequence data.
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