Hebeloma collariatum - A non-current Hebeloma species

According to our data Hebeloma collariatum is not the name of a current valid species of Hebeloma. Our database has records for the following similar names

Full name: Hebeloma collariatum Bruchet (1970)
Published: Bull. Mens. Soc. Linn. Lyon 39, supplement 6: 125 (1970)
Taxonomic status: Heterotypic synonym of H. velatum
Types: FRANCE: Vaucluse, Notre-Dame-des-Lumieres (approx. 43.82°N, 5.28°E, alt. approx. 250 m a.s.l.) on decomposed litter under Populus sp. and Salix sp., 24 Oct. 1966, G. Bruchet (Lectotype. herbarium acc. no. LY BR66-97, HJB12913). Lectotype designated by Beker et al., Hebeloma (Fr.) P. Kumm.: (2016) page 582 (MBT202528).

The material now in the herbarium packet of the holotype is H. eburneum, which does not match the protologue and diagnosis. It appears that the original material of the holotype has been lost and therefore one of the paratypes, collected from the same location as the holotype, on the following day, was designated as lectotype.

Original diagnosis: Hebeloma collariatum sp. nov. - Cortina in superficiei stipitis adulti praesente, sub specie collarii aequalis, constantis, ac tenuissimi; pileo 20-30 mm lato, convexo vel e plano convexo, non vel parum viscoso, concolore ac brunneolo; stipite 50-70 x 3-4 mm, gracilis, et subtiliter aereo; lamellis siccis; odore nullo; pilis marginum inferne ad 6-9 μm inflatis. Sporis 11-13 x 6-6,5 μm, ovatis ac obtusis, rugosis. Praeter rivulos, sub salicibus.

English translation: Cortina present on the surface of the stipe in mature specimens, constant but very thin; pileus 20–30 mm broad, convex to plano-convex, not or weakly viscid, concolourous and brown; stipe 50–70 × 3–4 mm, slender, and delicately bronze-coloured; lamellae dry; odour absent; marginal hairs inflated, 6–9 μm wide in lower part. Spores 11–13 × 6–6.5 μm, vate and blunt, rugose. Along rivulet under Salix.

Commentary: The lectotype has been morphologically and molecularly studied and is: = Hebeloma dunense L. Corb. & R. Heim.

Full name: Hebeloma collariatum f. aprile (Romagn.) Esteve-Rav. (1995)
Published: Boletín de la Sociedad Micológia de Madrid 20: 143 (1995)
Taxonomic status: Heterotypic synonym of H. velatum
Basionym: Hebeloma aprile Romagn. (1983)

Types: FRANCE: Foret de Hez,Le Val Hemont, nr Hermes(Oise) (approx. 47.74°N, 2.54°W, alt. approx. 55 m a.s.l.) on calcareous, mossy soil in mixed woodland under Betula verrucosa, Pinus sylvestris and Salix sp., 1 May 1970, H. Romagnesi (R70-34) (Holotype. herbarium acc. no. PC 0022088, HJB1000032).

Commentary: See Hebeloma aprile Romagn.

Full name: Hebeloma collariatum f. psammicola (Bohus) Bohus (1995)
Published: Documents mycologiques 25 (98-100): 86 (1995)
Taxonomic status: Heterotypic synonym of H. velatum
Basionym: Hebeloma psammicola Bohus [as "psammocolum"] (1978)

Types: HUNGARY: Between Orkeny and Tatarszentgyorgy (approx. 47.1°N, 19.38°E, alt. approx. 120 m a.s.l.) on bare, sandy soil under Populus sp., 11 Nov. 1976, M. Babos, A. Friesz, det: G. Bohus (Holotype. herbarium acc. no. BP 96.935, HJB1000053).

Commentary: See Hebeloma psammicola Bohus.