Full name: Hebeloma kuehneri Bruchet [as “Kühneri”] (1970)
Published: Bull. Mens. Soc. Linn. Lyon 39, supplement 6: 125 (1970)
Taxonomic status: Heterotypic synonym of H. nigellum
Types: SWITZERLAND: Sesvenna,Marangun,Grisons (approx. 46.706°N, 10.402°E, alt. approx. 2350 m a.s.l.) on mossy soil in alpine meadow under Salix herbacea, 14 Aug. 1966, G. Bruchet (Lectotype. herbarium acc. no. LY BR66-15, HJB11598). Lectotype designated by Beker et al., Hebeloma (Fr.) P. Kumm.: (2016) page 604 (MBT202535).

Homotypic synonyms: Hebelomatis kuehneri (Bruchet) Locq. (1979) ["1977"]

Original diagnosis: Hebeloma kuehneri sp. nov. - Cortina fugacissima; pileo usque ad 20 mm lato, maturissime expanso, medio brunneo vel obscurissime brunneo, in margine ex ochraceo brunneolo, sive lucido, verum parum viscoso, sive toto pruinato; stipite 20-30 x 2-4 mm, cum intus, tum extra, toto fuscescente; lamellis siccis; odore nullo; sporis 11-13 x 6-7 μm, amygdaliformibus, in papillam summis elongatis, rugosis; pilis marginum inferne ad 7,5-9 μm inflatis. Species alpina, in locis muscosis (Philonotis tomentella Mol.) inter Salices herbaceus crescit.

English translation: Cortina very fugaceous; pileus up to 20 mm broad, at maturity expanded, at centre brown to dark brown, at margin first ochre then brownish, either shining, but weakly viscous, or entirely pruinose; stipe 20–30 × 2–4 mm, internally and externally browning with age; lamellae dry; odour none. Spores 11–13 × 6–7 μm, amygdaloid, with long apical papilla, rugose; marginal hairs broadened in lower part up to 7.5–9 μm. Alpine species, growing in damp places (Philonotis tomentella Mol.) between Salix herbacea.

Commentary: Given the holotype has been lost, we have studied the lectotype BR66-15 and paratype BR66-14 and, both morphologically and molecularly, they correspond to Hebeloma nigellum. (We have also studied paratype BR69-08 and this is H. dunense, which is not in accordance with the protologue.) So we are confident that this taxon, as lectotypfied here: = Hebeloma nigellum Bruchet.

Full name: Hebelomatis kuehneri (Bruchet) Locq. (1979) ["1977"]
Published: Flore Mycologique Vol III - Text. Cortinariales A: 146 (1979) ["1977"]
Taxonomic status: Heterotypic synonym of H. nigellum
Notes: Nom. inval. (Art. 41.5 - Melbourne).

Types: SWITZERLAND: Sesvenna,Marangun,Grisons (approx. 46.706°N, 10.402°E, alt. approx. 2350 m a.s.l.) on mossy soil in alpine meadow under Salix herbacea, 14 Aug. 1966, G. Bruchet (Lectotype. herbarium acc. no. LY BR66-15, HJB11598). Lectotype designated by Beker et al., Hebeloma (Fr.) P. Kumm.: (2016) page 604 (MBT202535).

The holotype appears to be lost; a paratype was designated as lectotype.

Homotypic synonym of: Hebeloma kuehneri Bruchet [as “Kühneri”] (1970)

Commentary: See Hebeloma kuehneri Bruchet.