Full name: Hebeloma hortense Burt (1919)
Published: Annals of the Missouri Botanical Garden 6 (3): 172 (1919)
Taxonomic status: This is a Agrocybe.
Notes: Current name: Agrocybe hortensis (Burt) Singer, Sydowia 30 (1-6): 202 (1978).

Types: UNITED STATES: Missouri: Missouri Botanical Garden, St Louis (approx. 38.6128°N, 90.2594°W, alt. approx. 160 m a.s.l.) on grassy, nutrient-enriched soil and dung in urban garden, 3 Jun. 1919, E.A. Burt, det: C.H. Kauffman (Isotype. herbarium acc. no. MICH 10750, HJB1000370; Isotype. herbarium acc. no. FH 00533811, HJB1000555).

The collection from FH is from Burt Herb. and is mentioned in the protologue.

Diagnosis: Hebeloma hortense Burt, n. sp. Plate 3 §Denudata. Pileus glabrous, veil absent from the first. Type: in Mo. Bot. Gard. Herb., 54130, and in Burt Herb. Pileus fleshy, convex, umbonate, becoming expanded, even, glabrous, pale Isabellar color when moist, becoming cartridge­buff, with the umbo pinkish buff, the margin slightly inrolled when very young; flesh whitish, farinaceous; odor not disagreeable, not of radishes; lamellae broad, slightly sinuate, moderately close, white at first, becoming Isabella-color, the edge entire and not distilling drops; stem fleshy, hollow, equal or slightly bulbous at the base, fibrillose:), mealy above when young, with no trace of a veil or cortina; spores. Rood's brown in spore collection, even, 10- 11 x 6 µ,, borne in fours on protruding basidia; no cystidia present or not noteworthy. Pileus 4-10 cm. broad; stem 4-9 cm. long, 4-10 mm. thick. In cultivated borders where a straw manure had been worked into the ground. St. Louis, Missouri. Abundant in early June after prolonged rains. The fructifications occur singly or in small clusters of two or three. This species is noteworthy in its genus by ·absence of viscidity and odor of radishes, and by its large size and occurrence in abundance in cultivated ground. Nearly all other species of Hebeloma are inhabitants of forests and occur there sparingly. Fresh specimens have a pleasant farinaceous taste and odor, and keep well. This species is edible and with a pleasant and distinctive flavor.

Commentary: Following both molecular and morphological analysis of the isotype at MICH and the collection in FH from Burt. Herb. (mentioned in the protologue), this is confirmed as an Agrocybe.