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According to our data Hebeloma subcaespitosum is not the name of a current valid species of Hebeloma. Our database has records for the following similar names
Full name: Hebeloma subcaespitosum Bon (1978)
Published: Documents mycologiques 8 (29): 35 (1978)
Taxonomic status: Heterotypic synonym of H. velatum
Types: FRANCE: La Grande Motte Montpellier. (approx. 43.56°N, 4.08°E, alt. approx. 0 m a.s.l.) under Populus nigra, 6 Nov. 1977, M. Bon (Bon 771106) (Holotype. held at herbarium LIP, HJB1000130).

Original diagnosis: H. versipelle ss. Romagn. proximus sed robustior, saepe caespitosus, sporisque majoribus. Fortasse H. versipelli ss. Konr. et Maubl., ic. 78-1 pro parte similis. H. caespitosum nom. nud. in Docum. Mycol. 15: 3, synonymus est. (Sectio Hebeloma = Indusiata Sacc.). Pileus (1,5-)3-5(-7) cm, convexus vel late mammosus, raro subconico-campanulatus, deine applanatus vel leniter concavus, margine subinvoluta, aliquando flexuosa, pallida, sericea vel sublanata, interdum cum reliquis albis veli marginalis ornata; cuticula fibrilloso-sericea, in centro +/- viscosa, rufo-aurantiaca, versus discum obscurioir sed non distincte discolor, brunneo-rufescens, versus marginem paulatim pallidior, e ochraceo-alutacea cremeo-rava vel albido-argentea. Lamellae adnatae, subemarginatae, interdum arcuatae vel subdecurrentes, subangulatae, confertiores (45-55 x 1-2 lam.), postremo subdistantes, diu pallidae deinde argillaceae vel fulvo-ochraceae; margine pallida vix fimbriata; sporarum pulvis sordide ochraceo-roseus. Stipes (3) 4-8 (10) x 0,4-0,8 (1) cm., spongiosus dein fistulosus, subcylindraceus vel basi compressus (saepe compressione mutua plurum stipitem fasciculatorum, raro connatorum), sursum albus, sericeus, versus basim paulatim brunneo-fuscescens, praecipue de tactu, +/- lanatus proprie erga cortinam, circa tertiam partem superiorum. Caro albida vel ochracea, deorsum sordide brunnea; sapor amarescens, odor debilis raphanicus vel cacao revocans. Sporae (9)10-12-13) x (5,5) 6-7,5 (-8) μm, subellipticae, raro leviter amygdaliformes, apice obtuso, nunquam submammoso, sublaeves vel subtiliter rugulosae; cellulae marginales 30-50 (-60) x 3-7 μm, cylindrico-lageniformes, basi incrassatae, x 8-10 μm, collo flexuouso, suclavo, raro subcapitato; basidia 25-35 x 8-10 μm, tetraspora; trama regulatis, hyphis x 10-15 (-20) μm, interdum curtis vel subglobosis; fibulae numerosae; epicutis subviscida, hyphis gelatis; subcutis hyphis subintricatis, pigmento membranae ochraceo-luteo, sublaevi vel rugoso; hypocutis hyphis incrassatis, usque ad 10-20 μm, aliquando curtioribus sed non vere pseudoparenchyma simulantibus. In Salicetis Populetisque sabulosis frequens, saepe caespitosus, raro connatus.

English translation: Close to H. versipelle ss. Romagnesi, but caespitose and with larger spores. Perhaps partly the same as H. versipelle ss. Konr. & Maubl. Ic. 78-1. Synonym of H. caespitosum nom. nud. in Doc. Mycol. [4 (15): 3 (1974)] (Section Hebeloma = Indusiata Sacc.). Pileus (1.5) 3–5(–7) cm, convex or broadly umbonate, rarely subconical-campanulate, then applanate or slightly concave, with subinvolute margin, sometimes flexuose, pale, silky shining or subtomentose, sometimes with remnants of white marginal veil; cuticle fibrillose-shiny, at centre slightly viscous, reddish orange, darker towards centre but not really discoloured, brownish reddish, paler towards margin, from ochre-yellowish cream to whitish-silvery. Lamellae adnate, subemarginate, sometimes arcuate or subdecurrent, narrowish, rather crowded (45–55 × 1–2 lam.), at the end subdistant, pale at first then clay-coloured to reddish ochre with paler, fimbriate margin; spore print sordid ochre-pink. Stipe (3) 4–8 (10) × 0.4–0.8 (1) cm, spongy then fistulose, subcylindrical or with compressed base (often compressed in the multiple stipes in the bundle, never fused); white at apex, shiny, towards base weakly brown to reddish brown coloured, especially when handled; with persistent woolly cortina at one third of apex. Context white to ochre, towards base sordid brown; taste bitter; odour weakly raphanoid or reminiscent of cocoa. Spores (9)10–12(–13) × (5.5) 6–7.5(–8) μm, subelliptical, rarely slightly amygdaloid with blunt apex, never submammose; subglabrous or delicately rugulose; marginal cells 30–50 (–60) × 3–7 μm, cylindrical-lageniform with enlarged base, × 8–10 μm, with flexuous neck, subclavate, rarely subcapitate; basidia 25–35 × 8–10 μm, four-spored; trama regular, made up of 10–15(–20) μm wide hyphae, which are sometimes short or subglobose; clamps numerous; epicutis subviscid, hyphae 3–6 μm wide, hardly gelatinous, the endings subequal, somewhat tortuose or strangulate; subcutis subintricate with ochre yellow, subglabrous or rugose membranal pigment; hypocutis of inflated hyphae, up to 10–20 μm, sometimes rather short but never resembling a pseudoparenchym. Frequent in mixed forest of Salix and Populus on sandy soil, often caespitose, rarely fused.

Commentary: Bon did publish this under the provisional name of Hebeloma caespitosum in 1974, as mentioned in the protologue. We have examined the holotype, and, from both a molecular and a morphological perspective, this is: = Hebeloma dunense L. Corb. & R. Heim.

Full name: Hebeloma subcaespitosum var. psammicola (Bohus) Bohus [as “psammocolum”] (1983) ["1982"]
Published: Studia Botanica Hungarica 16: 42 (1983) ["1982"]
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.

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