Full name: Hebeloma horticola (G.H. Otth) Sacc. (1896)
Published: Hedwigia 35 (7): 6 (1896)
Taxonomic status: This is a Hebeloma but we have not been able to unambiguously determine the species.
Basionym: Agaricus horticola G.H. Otth (1871)

Types: Type not found. Described from Switzerland, Bern, in the former hospital garden in late autumn.

Original diagnosis: Pileus e disco carnoso attenuatus, expansus, umbonatus, margine primo subinvoluto araneoso-fibrosovelato, dein inflexo nonnihil introflexo, laevis, siccus, spadiceus aut badius, marginem versus pallescens et veli vestigia fibrillis vulso diutius retinens. Lamellae sordide carneae, cinnamomeae, vix confertae, postice rotundato adnatae interdum cum denticulo minutissimo, acie pl.m. distincte serrulata et primitus albicante. Stipes teres flexuosus, basi obtusa non aut parum incrassata, fibroso-subtenax, extus fibrillis laxis parce obsitus, sursum albicans pruinosus, deorsum infuscatus, tubulus cum appendicula subulata carnosa e pilei substantia in tubulum descendenti. Pilei caro albida, sub brunnescens; stipes extus intusque concolor usque ad 6 centim. dilatatus, lamellae circiter 6 mm latae; stipes 6-7 centim. longus, 6-7 millim. crassus.

English translation: Pileus attenuate from the fleshy disk, expanded, umbonate, with the margin at first more or less involute arachnoid fibrous veiled, thereafter inflexed somewhat introflexed, smooth, dry, dark reddish brown to dull reddish brown, towards the margin becoming pale, and of the velum remnants with fibres usually long persistent. Lamellae dirty flesh-coloured, pale brown, not very close together, at the back rounded, adnate, sometimes with a very small tooth, with the edge more or less distinctly serrulate and at first whitish. Stipe terete, flexuose, at base obtuse or a little thickened, fibrose a bit tough, outside sparsely covered with lax fibrils, white pruinose at apex, towards base turning brownish, cavity ending in a point, and flesh of pileus descending in stipe cavity. Pileus with white flesh turning brown; stipe outer and inner side concolourous, up to 6 cm broad, lamellae circa 6 mm broad; stipe 6–7 cm long, 6–7 mm broad.

Commentary: From the protologue it does appear very likely that this is a Hebeloma from Hebeloma sect. Hebeloma. With the pileus described as two-coloured, reddish brown in the centre and becoming paler towards the margin, this could be H. mesophaeum, but the given stipe width is quite large for this species. We conclude that without original material we cannot give an unambiguous determination.

Full name: Agaricus horticola G.H. Otth (1871)
Published: Mittheilungen der Naturforschenden Gesellschaft in Bern 91: 91 (1871)
Taxonomic status: This is a Hebeloma but we have not been able to unambiguously determine the species.
Is basionym of: Hebeloma horticola (G.H. Otth) Sacc. (1896)

Types: Type not found. Described from Switzerland, Bern, in the former hospital garden in late autumn.

Commentary: See Hebeloma horticola (G.H. Otth) Sacc.