Types: Not designated. Described from Sweden.

Homotypic synonyms: Inocybe vatricosa (Fr.) P. Karst. (1879)

Original diagnosis: Gregarious, pileo subcarnoso convexo-plano albido glabro, lamellis albido-fuscescentibus latis, stipites fistuloso curvato contorto pulverulento. Fungus parvus, totus albus, pileolo mammoso, pediculo intorto, annulo fugaci cinereo, Mich. Gen. p. I78· n. 4. Habitat in silvis ad terram nudam, locis declivis: Septembri. Diversa a priori omnino videtur species. Etiam gragarius, stipes fistulosus, 1 unc. longus nec ultra, 1 lin. crassus, subequalis teres curvato-adscendens, saepe etiam contortus firmus albus puverulentus, basi villosus saepe incrassatus. Pileus carnosus convexus, demum explanatus subumbonatus, 2/8 – ½ unc. circiter latus, sordide albidus siccus glaber laevis; detritus tamen striatulus. Caro tenuissima aquosa. Lamellae adnatae alternate distinctae semiovatae, 2 lin. circiter latae, juniors sordide albidae, dein obscuriores fuscescenti-griseae; sed pallescentes. Cortina fugax albida. Odor subaniseus. Differt igitur praecipue colore lamellarum nunquam flavo.

English translation: In groups, pileus thin-fleshed, plano-convex, white, glabrous, lamellae white then brown, broad, stipe fistulose, curved, twisted, powdered. Tiny fungus, entirely white with umbonate pileus, twisted stipe and ash-coloured fugacious annulus, Mich. Gen. p. I78· n. 4. growing in woodlands on naked soil in steep places in September. A species that seems to differ from the former. Furthermore it grows in groups. Stipe hollow, not more than 2.5 cm long, 2.5 mm wide, with villose base, which often is enlarged. Pileus fleshy-convex, then expanded, subumbonate, circa 0.5–1.5 cm broad, sordid white, dry, glabrous, smooth; obscurely striatulate. Context very thin, watery. Lamellae adnate, distinctly alternating, semiovate, about 5 mm broad, when young sordid white then darker brownish-greyish, but pallescent. Cortina fugacious, white. Odour slightly like aniseed. Differs in particular by the lamellae that are never yellow.

Commentary: According to the protologues, A. vatricosus is at most 1.5 cm broad, white, and with a pruinose stipe with a fugacious ring-zone. We do not believe it is a Hebeloma species, but more likely a species of Inocybe. Kuyper (1986) suggests it is reminiscent of I. umbratica Quél.