Hebeloma bulbosum - A non-current Hebeloma species

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

Full name: Hebeloma bulbosum Fayod (1893) ["1892"]
Published: Annali, R[eale]. Accademia d’Agricoltura di Torino 35 (6): 95 (1893) ["1892"]
Taxonomic status: This is a Hebeloma but we have not been able to unambiguously determine the species.
Types: Not located in G. Described from Italy, Jaco-Punt, Bricherasio Pedemontii, under Betula and Alnus.

Original diagnosis: Fungus albus vel lutescens, pileo hemisphaerico, laevi, dein pulvinato, c. 4-5 cm. lato, umbone obtuso, jove udo subviscoso; carne alba (centro circiter, 1 cm. crassa), stipite medullato farcto (6-7 cm. longo, 0,5 cm. lato), albo apice farinoso, basi in bulbillo subsphaerico inflato; lamellis liberis, subconfertis, acie crenulatis et albo punctatis, cinnamomeis. Dispositio lamellarum et schemate 13231 expressa est. Hab. Catervatim in graminosis, betuletis et alnetis, in alpibus Pedemontium (Jaco-punt, Bricherasio), septembri mense. Obs. Micr. Trama sat regularis; subhymenium pseudoparenchymaticum monostratum. Paraphysae clavatae. Basidia emergentia (27 x 9 μm) tetrasterigmatica. Sporae (9 x 6 μm) ovoideo-conicae, laeves vel subtiliter punctatae, sub. micro ochraceae. - Cuticula pilei monostrata, glutinosa.

English translation: A white or yellowing Fungus. Pileus hemispherical, smooth, then cushion-shaped (convex), c. 4–5 cm broad, with blunt umbo, subviscid when young and moist, context white (centre ca. 1 cm thick); stipe stuffed, medullate (6–7 cm long, 0.5 cm wide), white with mealy apex, base inflated, subbulbous; lamellae free, rather crowded, with crenulate, white punctate edge, cinnamon-coloured. Spore print like 13231 in schema. In groups among grass near Betula and Alnus, in the Alps of Piedmont (Jaco-punt, Bricherasio), September. Microscopic observations: Trama rather regular; subhymenium pseudoparenchymatical, unilayered. Paraphyses clavate. Basidia emerging, (27 × 9 μm). Spores (9 × 6 μm) ovoid-conical, smooth or slightly punctate, ochraceous under microscope. Cuticle of pileus unilayered, glutinous.

Commentary: The diagnosis brings to mind Hebeloma sect. Velutipes, and within that section H. leucosarx and H. velutipes. However, without a photograph or type collection we cannot make a determination.

Full name: Hebeloma bulbosum Romagn. (1983)
Published: Sydowia 36: 263 (1947) ["1983"]
Taxonomic status: Heterotypic synonym of H. velutipes
Notes: Nom. illegit. (Art. 53.1), non Hebeloma bulbosum Fayod, Ann. R. Acc. d’Agr. Torino 35: 95 (1893) [“1892”]. Replaced by the homotypic synonym: Hebeloma favrei Romagn. & Quadr., in Quadraccia, Doc. Mycol. 14: 31 (1985) [“1984”].

Types: FRANCE: Landes, Aureilhan (approx. 43.24°N, 0.09°E, alt. approx. 310 m a.s.l.) on boggy, decomposed soil and litter in woodland ditch under Pinus pinaster and Quercus pendunculata, 13 Oct. 1977, H. Mesplede, det: H. Romagesi (77.333) (Holotype. herbarium acc. no. PC0091492, HJB1000061).

Homotypic synonym of: Hebeloma favrei Romagn. & Quadr. (1985) ["1984"]

Original diagnosis: Synonyme: Hebeloma crustuliniforme var. bulbiferum Favre non R. Maire, loc. cit. p. 488). - Pileo (2)-2.5-5.7 cm, primum e campanulato convexo, dein expanso, margine anguste involuta, dein magis minusve undata, e rufulo ochraceo, in ambitu pallidiore, cute viscidula, laeve atque paulum micacea, vetustate rugulosa. Stipite brevi, 2.5-5 x 0.5-0.7 cm, sursum cylindrato, deorsum manifeste bulbosa (usque ad 1 cm), plena, dein medullato, demum cavo, cortice firmo, albo vel albido, fere toto pruinoso. Carne crassiuscula, firmula, albida, paulum pallidissimo colore brunneolo in cortice stipitis tincta. Odore raphanoideo, sapore amarescente. Lamellis stipatis, triplici serie lamellularum, (2-)3-5 mm latis, rotundatis subliberis vel adnatis, pallide argilaceis, acie crenata ac guttulis plerumque limpidis, interdum lacteis. - Sporis late ovoideis-amygdaliformibus, (8.7-) 9-11.7 x 6-6.8 μm, 10-11.7 x 5.7-6.5-(8) μm (NH4OH), luteolis, sublaevibus vel subtiliter punctatis. Basidiis 20-32 x 8-10 μm. Pilis marginalibus longe clavatis, interdum inferne ampullaceis, 37-60-(80) x 5-6 μm x 6-9 m. Epicute gelata, pilis erectis (ixotrichodermate) longioribus x 3-4 μm, cylindratis, haud vel parum summis incrassatis, brevioribus (in strato inferiore) manifeste clavatis (5-7 μm), sparsis; subcute magis minusve manifeste specie pseudoparenchymatica. Fibulis praesentibus. - Sub Pinis pinastris, Quercibusque pedunculatis, locis graminosis, fossis luteis.

English translation: Pileus (2–)2.5–5.7 μm, at first campanulate convex then expanding, with narrowly involute margin, then strongly more or less undulating, first reddish then ochraceous, paler at margin, with slightly viscid cuticle, glabrous and weakly micaceous, with rugulose covering. Stipe short, 2.5–3.5 × 0.5–0.7 cm, cylindrical in upper part, manifestly bulbous at base (up to 1 cm), solid then medullate finally hollow, with firm cortex, white or whitish, almost entirely pruinose. Context rather thick and firm, white in cortex of stipe very pale brown. Odour aphanoid. Taste bitter. Lamellae crowded with three lengths of lamellulae (2–)3–5 mm broad, rounded almost free or adnate, pale clay-coloured, with crenulate edge and guttulate with a clear or sometimes milky liquid. Spores broadly ovoid-amygdaloid, (8.7–) 9–11.7 × 6–6.8 μm, 10–11.7 × 5.7–6.5(–8) μm in NH4OH, yellowish, almost smooth or subtly punctate. Basidia 20–32 × 8–10 μm. Marginal hairs long clavate, sometimes ampulliform below, 37–60 (–80) × 5–8 μm. Epicutis gelatinous, with long erect hairs (ixotrichoderm), 3–4 μm wide, cylindrical, not or at apex slightly enlarged, rarely widened in lower part and distinctly clavate (5–7 μm); subcutis somewhat more parenchymatical. Clamps present. With Pinus pinaster and Quercus pedunculata in grassy spots in muddy ditches.

Commentary: See Hebeloma favrei Romagn. & Quadr.