Full name: Hebeloma fimicola S. Imai [as "fimicolum"] (1938)
Published: Journal of the Faculty of Agriculture, Hokkaido Imperila University 43 (2): 227 (1938)
Taxonomic status: This is a Agrocybe.
Notes: Current name: Agrocybe imaii Beker & U. Eberh. Mycol. Prog. 21: 458 (2022)

Types: JAPAN: Hokkaido, Ishikari, Sapporo (approx. 43.1714°N, 141.3155°E, alt. approx. 5 m a.s.l.) on dung, Jun. 1935, S. Imai (Holotype. herbarium acc. no. SAPA10000036 (No. 383), HJB1000377).

Original diagnosis: Subcaespitosum vel gregarium. Pileo 1.5-3 cm. lato, hemisphaerico vel convexo, dein subplano, viscidulo, glabro, "ochraceous­tawny", margine pallidiore et glabro vel leviter albo-sericeo; carne albida vel flavidula, tenui, odore subfarinaceo, sapore nullo; lamellis sinuatis, confertis, ventricosis, e albido cinnamomeis, acie fimbriatis; stipite 4-6 cm. longo, 4-5 mm. crasso, subaequali, pallidiore, fibrilloso, cavo; vela alba, fugaci; sporis in cumulo fulvo-ferrugineis, late ellipsoideis, 12.5-16.5 X 8-10 µ , laevibus; cystidiis fusiformibus, hyalinis.

English translation: Subcaespitose or gregarious. Pileus 1.5-3 cm broad, hemispherical or convex, then subapplanate, slightly viscid, smooth, “ochraceous-tawny”, margin lighter-coloured and smooth or silky-white; context whitish or yellowish, thin, smell almost mealy, taste none; lamellae sinuate, crowded, ventricose, whitish to cinnamon, edge fimbriate; stipe 4-6 cm long, 4-5 mm thick, subcylindraceous, paler, fibrillose, fistulose; veil white, fugacious; spores rusty-fulvous in mass, broadly ellipsoid, 12.5-16.5 x 8-10 μ, smooth; cystidia fusiform, hyaline.

Commentary: Hebeloma fimicola is an Agrocybe. Our examination of the type material was in close agreement with the description of Imai (1938). It is possible, even likely, that A. imaii is a later synonym of A. pediades s.l., and, given its habitat on dung, may be A. pediades var. fimicola (Speg.) Nauta (Agrocybe fimicola (Speg) Sing.) (Nauta 2005), but we rather leave it to experts on the genus based on multilocus sequence data to come to a conclusion. Based on ITS data, Agrocybe pediades occurs in many countries including China, India, Iraq, Pakistan, and Sri Lanka (see Eberhardt et al. 2022b and UNITE SH2290413.08FU). Japanese name: Baba-wakafusa-take (Imai 1938).