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According to our data Hebeloma angustispermum is not the name of a current valid species of Hebeloma. Our database has records for the following similar names
Full name: Hebeloma angustispermum A. Pearson (1951) ["1950"] nom. rej.
Published: Transactions of the British Mycological Society 33 (3-4): 301 (1951) ["1950"]
Taxonomic status: Heterotypic synonym of H. cylindrosporum
Notes: A proposal to conserve the name H. cylindrosporum against H. angustispermum was proposed by Vesterholt et al., Taxon 58: 15 (2009), recommended by Norvell, Taxon 60: 224 (2011) and ratified by Barrie, Taxon 60: 1212 (2011).

Types: SOUTH AFRICA: Cape Province, Bergvliet (approx. 34.05°S, 18.45°E, alt. approx. 20 m a.s.l.) under Pinus pinea, 26 May 1948, A.A. Pearson (Holotype. herbarium acc. no. K(M)129174, HJB1000048).

Original diagnosis: Gregaria ad terram sub Pinus pinea, Maio 1948. Pileus 2-6 mm, carnosus, viscidus, e convexo planus, alutaceo-pallidus, centro obscuriori dein ferruginosus, laevis, politus; cute secernibili; margine primitus incurvato, laevi, opaco. Lamellae confertae, lineares, adnatae, angustae, modice elasticae, tenues, brunneo-tabacinae, acie alba erosa. Stipe 2-6 cm. longus, 3-5 mm. crassus, siccus aequalis vel apice incrassatus, basi plerumque aliquantulum inflato, solidus dein cavus, sub-cartilaginosus; albus demum sordide brunneus, sursum granulatus, deorsum squamulosus. Caro alba dein pallide alutacea. Sapor mitis dein amarus. Odor su-nullus vel leviter funginus. Sporae in pulvere tabacino-brunneae: sub microscopio brunneae subopacae; oblong-ellipsoideae, 8-10 x 4-4,5 μm minute verrucosae. Cellulae in acie lamellarum cylindricae 5-7 μm latae.

English translation: In groups on soil under Pinus pinea. May 1948. Pileus 2–6 mm, fleshy, viscid, convex then plane, buff with darker centre then rusty brown, with peeling cuticle, smooth, polished; margin slightly incurved at first. Lamellae crowded, linear, narrow, adnate, rather elastic, thin, tobacco-brown (snuff brown), with eroded, whitish edge. Stipe 2–6 cm long, 3–5 mm wide, equal, or slightly thickened above and usually swollen at base, solid then hollow, sub-cartilaginous; white then sordid brown, granular at apex, downwards squamulose. Flesh white then pale alutaceous. Taste mild then bitter. Odour almost absent or slightly fungal. Spores in mass tobacco brown, under the microscope brown, subopaque, oblong-ellipsoid, 8–10 × 4–4.5 μm, minutely verrucose. Cystidia on lamella edge cylindrical, 5–7 μm broad.

Commentary: Based on morphology and ITS this is synonymous with H. cylindrosporum. Although H. angustispermum is the older name, in Vesterholt et al. (2009) we proposed the conservation of the name Hebeloma cylindrosporum over H. angustispermum. This was because the name H. cylindrosporum is widely used, in particular by many researchers working on mycorrhizas. The proposal has been accepted, hence: = Hebeloma cylindrosporum Romagn., nom. cons.

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