Full name: Agaricus fastibilis β subumbonatus Schulzer [as "A. (Hebeloma) fastibilis β. subumbonatus"] (1870)
Published: Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 20: 192 (1870)
Taxonomic status: Heterotypic synonym of H. subtortum
Types: Not designated. Described from Northern Hungary in a Corylus stand.

Original diagnosis: Gruppenweise und rasenförmig auf Grasboden in Haselstrauch-Beständen. Alle Theile anfängs weiss, nur der Hutscheitel licht fleischfarb-bräunlich, welche Farbe sich spätter über der ganzen Hut ausbreiten, und auch von den Lamellen angenommen wird. Der erst fast halbkugeligen Hut mit erhobenen Scheitel breitet sich aus und erhält einen verflachten Schild in der Mitte. Er ist mässig-fleichig, an Rande sehr dünn, 1.5-2 unc. breit. bei nassem Wetter klebrig, anfangs – besonders am Rande – mit Fäserchen bekleidet, zuletzt völlig kahl. Lamellen nicht besonders dicht, breit angewachsen, fast entrandet mir einer Spitze herablaufend, 2-4 lin. breit. Strunk beinahe walzenförmig, 2-4 lin. dick, 1 bis etwas über 2 unc. lang, in den Hut übergehend, voll, nur sehr spat hohl, faseriger Substanz, seidenglänzend, and der Spitze mehlig-schuppig. Der in der Jugend gur sichtbare faserige Schleier ist ebenfalls Weiss. Spores verkehrt-eiförmig, 0.008 mm. lang, licht umber-rostbraun. Geruch und Geschmack unangenehm.

English translation: In groups in grassy spot in Corylus copses. White in all parts at first, only incarnate-brown at centre of pileus, which colour expands over the whole pileus with age, and also becomes the colour of the lamellae. The at first hemispherical pileus with elevated centre expands and becomes a flat umbo at the centre. It is moderately thick fleshed, very thin at margin, 4–5 cm broad, viscid in wet weather, in the beginning – especially at margin – covered with fibrils, finally completely bald. Lamellae not very crowded, broadly adnate, almost emarginate with a small decurrent tooth, 5–10 mm broad. Stipe almost cylindrical, 5–10 mm thick, 2.5 to more than 5 cm long, confluent with pileus, stuffed, only later becoming hollow, with a fibrous consistency, silky-shining, farinaceous-squamulose at apex. In its young stages the well developed veil is equally white. Spores obovoid, 8 μm long, light umber-brown. Odour and taste unpleasant.

Commentary: Judging from the original description (pale colours, presence of a cortina, spore length 8 µm, stipe width 5–10 mm), we consider Agaricus fastibilis β subumbonatus to be: = Hebeloma subtortum P. Karst.

Full name: Agaricus fastibilis var. mesophaeus Pers. (1828)
Published: Mycologia Europaea: 173 (1828)
Taxonomic status: Is basionym of H. mesophaeum
Is basionym of: Hebeloma mesophaeum (Pers.) Quél. (1872) nom. cons.; Hebeloma versipelle subsp. mesophaeum (Pers.) Konrad & Maubl. (1929); Agaricus mesophaeus (Pers.) Fr. (1838) ["1836-1838"]; Inocybe mesophaea (Pers.) P. Karst. (1879); Hylophila mesophaea (Pers.) Quél. (1886); Inocybe versipellis var. mesophaea (Pers.) S. Petersen (1911); Hebeloma versipelle var. mesophaeum (Pers.) Costantin & L.M. Dufour [as "mesophaeus"] (1891)

Types: DENMARK: NEJ, Kirkemilen,Skagen Klitplantage UTM NJ 91,97 TBU 01 (approx. 57.71°N, 10.55°E, alt. approx. 5 m a.s.l.) on sandy soil in coniferous woodland plantation under Pinus sylvestris and Salix repens, 26 Sep. 2003, A. Eriksen, J. Vesterholt (JV-03-547), det: J. Vesterholt (Epitype. herbarium acc. no. C JV-03-547, HJB10854). Epitype designated by Beker et al., Taxon 62 (5): (2013) page 1059.

FRANCE: in woodland under Pinus sp. and Quercus sp., , C.H. Persoon (Neotype. herbarium acc. no. L910.255-852, L L0115239, HJB1000296). Neotype designated by Singer, Persoonia 2 (1): (1961) page 33.

The neotype was designated as a “lectotype” by Singer (Persoonia 2: 33, 1961) but there are no indications as to the date of collection (or even location) and therefore it is not certain that it represents original material studied before the publication of the name. However Singer’s designation can be considered a neotypification under Art. 9.9. This material is in accordance with the protologue and as there are no other candidate original materials and no cited illustrations we accept this as a neotype.

Commentary: See Hebeloma mesophaeum (Pers.) Quél.

Full name: Agaricus fastibilis Pers. (1801): Fr. (1821)
Published: Synopsis Methodica Fungorum (Gottingen): 326 (1801)
Taxonomic status: Heterotypic synonym of H. laterinum
Is basionym of: Hebeloma fastibile (Pers.) P. Kumm. (1871) nom. rej.; Roumeguerites fastibilis (Pers.) P. Karst. (1882) ["1883"]; Inocybe fastibilis (Pers.) P. Karst. (1879); Hylophila fastibilis (Pers.) Quél. (1886); Picromyces fastibilis (Pers.) Earle (1909)

Types: Batsch, Elench. Fung. 2: 326 (1789) Pl. 33, Fig. 195, lectotype (icon) designated by Beker et al., Taxon 62 (5): (2013) page 191

Herb. Persoon L 910.258-593 (Database Record 1000014) was proposed as lectotype by Singer (1961), but it is not verifiable as original material so is not a candidate for lectotypification.

Commentary: See Hebeloma fastibile (Pers.) P. Kumm.

Full name: Agaricus fastibilis var. albus Fr. [as "alba"] (1838) [“1836-1838”]
Published: Epicrisis Systematis Mycologici seu Synopsis Hymenomycetum: 178 (1838) ["1836-1838"]
Taxonomic status: This is a Hebeloma but we have not been able to unambiguously determine the species.
Is basionym of: Hebeloma fastibile var. alba (Fr.) Sacc. (1887)

Types: Not designated. Described from Sweden.

Commentary: See Hebeloma fastibile var. alba (Fr.) Sacc.

Full name: Roumeguerites fastibilis (Pers.) P. Karst. (1882) ["1883"]
Published: Meddelanden af Societas pro Fauna et Flora Fennica 9: 59 (1883)
Taxonomic status: Heterotypic synonym of H. laterinum
Basionym: Agaricus fastibilis Pers. (1801): Fr. (1821)

Types: Batsch, Elench. Fung. 2: 59 (1789) Pl. 33, Fig. 195, lectotype (icon) designated by Beker et al., Taxon 62 (5): (2013) page 191

Herb. Persoon L 910.258-593 (Database Record 1000014) was proposed as lectotype by Singer (1961), but it is not verifiable as original material so is not a candidate for lectotypification.

Homotypic synonym of: Hebeloma fastibile (Pers.) P. Kumm. (1871) nom. rej.

Commentary: See Hebeloma fastibile (Pers.) P. Kumm.

Full name: Inocybe fastibilis (Pers.) P. Karst. (1879)
Published: Bidrag Kännedom Finlands Natur Folk 32: 467 (1879)
Taxonomic status: Heterotypic synonym of H. laterinum
Basionym: Agaricus fastibilis Pers. (1801): Fr. (1821)

Types: Batsch, Elench. Fung. 2: 467 (1789) Pl. 33, Fig. 195, lectotype (icon) designated by Beker et al., Taxon 62 (5): (2013) page 191

Herb. Persoon L 910.258-593 (Database Record 1000014) was proposed as lectotype by Singer (1961), but it is not verifiable as original material so is not a candidate for lectotypification.

Homotypic synonym of: Hebeloma fastibile (Pers.) P. Kumm. (1871) nom. rej.

Commentary: See Hebeloma fastibile (Pers.) P. Kumm.

Full name: Hylophila fastibilis (Pers.) Quél. (1886)
Published: Enchiridion Fungorum in Europa Media et Praesertim in Gallia Vigentium: 98 (1886)
Taxonomic status: Heterotypic synonym of H. laterinum
Basionym: Agaricus fastibilis Pers. (1801): Fr. (1821)

Types: Batsch, Elench. Fung. 2: 98 (1789) Pl. 33, Fig. 195, lectotype (icon) designated by Beker et al., Taxon 62 (5): (2013) page 191

Herb. Persoon L 910.258-593 (Database Record 1000014) was proposed as lectotype by Singer (1961), but it is not verifiable as original material so is not a candidate for lectotypification.

Homotypic synonym of: Hebeloma fastibile (Pers.) P. Kumm. (1871) nom. rej.

Commentary: See Hebeloma fastibile (Pers.) P. Kumm.

Full name: Picromyces fastibilis (Pers.) Earle (1909)
Published: Bulletin of the New York Botanical Garden 5 (18): 438 (1909)
Taxonomic status: Heterotypic synonym of H. laterinum
Basionym: Agaricus fastibilis Pers. (1801): Fr. (1821)

Types: Batsch, Elench. Fung. 2: 438 (1789) Pl. 33, Fig. 195, lectotype (icon) designated by Beker et al., Taxon 62 (5): (2013) page 191

Herb. Persoon L 910.258-593 (Database Record 1000014) was proposed as lectotype by Singer (1961), but it is not verifiable as original material so is not a candidate for lectotypification.

Homotypic synonym of: Hebeloma fastibile (Pers.) P. Kumm. (1871) nom. rej.

Commentary: See Hebeloma fastibile (Pers.) P. Kumm.