Full name: Hebeloma capniocephalus (Bull.) Gillet (1876)
Published: Hymén. Fr. Ch. Thomas, Alençon: 527 (1876)
Taxonomic status: This is a Lyophyllum.
Notes: Current name is Lyophyllum capniocephalum (Bull.) Kühner, Bull. mens. Soc. linn. Soc. Bot. Lyon 7: 211 (1938).

Basionym: Agaricus capniocephalus Bull. (1792)

Types: Bulliard, Herb. Fr.: 527 (1792) tab. 547:2, lectotype (icon) designated by Beker et al., Hebeloma (Fr.) P. Kumm.: (2016) page 578 (MBT201355)

Homotypic synonyms: Hebelomatis capniocephalum (Bull.) Locq. (1979) ["1977"]; Derminus capniocephalus (Bull.) Henn. (1898)

Original diagnosis: In sylvis autumno habitat; terrestris, plerumque solitarius. Stipes crassus, basi ut plurimum attenuatus, plenus, nudus, glaber, saepe lineatus, subfuligineo-albidus aut pileo concolor, juxta lamellae 12 millim (4-6 lin.) latus, 4-6 centim. (18-24 lin) altus. Pileus primum suborbicularis, dein semiorbicularis, demum complanatus, saturate vel dilute fuligineus, aetate provecta, margine nigricans, fig. B, 4-7 centim. (20-30 lin.) latus. Caro tenius, firma, nivea, interdum dilute fulliginea. Lamellae basi aduncae, fig. D., liberae, crassisimae, latissimae, subfuligineae vel fuscae.

English translation: Growing in autumn in the forest on the ground, often solitary. Stipe thick, strongly attenuated at base, solid, naked, glabrous, marked by longitudinal lines, whitish brown or concolourous with pileus, at apex (near lamellae) 12 mm wide, 4–6 cm long. Pileus subglobose at first, then hemispherical, finally expanded, saturated or pale brown, with blackening margin when fully expanded, 4–7 cm broad. Context thin, white, sometimes diluted brown. Lamellae emarginate, free, very thick, very broad, dark brown.

Commentary: The original plate 547 of Agaricus capniocephalus shows a species with blackening pileus margin similar to that known in some Lyophyllum species, and a feature which is emphasized in the description. In the discussion it is compared with “L’Agaric nigrescent” (Russula nigrescens (Bull.) Fr., pl. 212) which should differ by blackening entirely. It is also compared with “L’Agaric molibdocéphale” (A. molybdocephalus Bull. pl. 523), apparently a synonym of Lyophyllum decastes (Fr.) Singer (Ludwig 2001). We believe that Agaricus capniocephalus is a Lyophyllum species, but unlike Ludwig we are not convinced that it necessarily represents L. tenebrosum Clémençon.

Full name: Hebelomatis capniocephalum (Bull.) Locq. (1979) ["1977"]
Published: Flore Mycologique Vol III - Text. Cortinariales A: 146 (1979) ["1977"]
Taxonomic status: This is a Lyophyllum.
Notes: Nom. inval. (Art. 41.5 - Melbourne).

Basionym: Agaricus capniocephalus Bull. (1792)

Types: Bulliard, Herb. Fr.: 146 (1792) tab. 547:2, lectotype (icon) designated by Beker et al., Hebeloma (Fr.) P. Kumm.: (2016) page 578 (MBT201355)

Homotypic synonym of: Hebeloma capniocephalus (Bull.) Gillet (1876)

Commentary: See Hebeloma capniocephalum (Bull.) Sacc.