Full name: Agaricus decoratus Lindgr. [as "Agaricus (Hebeloma) decoratus"] (1845)
Published: Botaniska Notiser 12: 199 (1845)
Taxonomic status: We have not been able to unambiguously determine the current genus of this name.
Types: Not located. Described from Sweden: Lidköping, Råda, Svarte Gärdet, in wooded meadow, Sep. 1845.

Original diagnosis: Agaricus (Hebeloma) decoratus, pileo subviscoso carnoso, undulato-repando expanso umbone pallidiori, primitus velo lanoso lutescente-pallido peronato dein con centrice squamoso, stipites subflexuoso annulato fistuloso, fusiformi radicato striato e pallido lutescente-ligneo apice pruinoso, lamellis emarginatis-adnexis epunctatis ex albido pallide cinamomeis. Inter gramina in prato sylvestri elevato Svarte Gärdet dicto in paroecio Råda extra Lidköping, copiose Sept. seriori 1845. Pi. 2 unc. et ultra lat. Stip. 3-4 unc. long. 4-6 lin. crassus – Species Hebelomat. Eximia. Pileus junior e velo margine primitus dense peronatus, in modum fere Cortinariorum turmalis et lanigeri. Pileus maturus e velo concentrice squamosus, et junior et demum, etiam jove pluvio, levissime tantum, saepe inconspicue, viscosus, plus minus undulate-repandus, junior praesertim fuscescens, sed disco semper lutescente pallidiori. Stipes e pallido lutescente-ligneo demum magis magisque fuscescenti-striatus, plerumque oblique annulatus (saepe distincte biannulatus). Lamellae prorsus epunctatae sub lente tantum tenuissime ciliatulae. Orod Hebelomatum debilis.

English translation: Agaricus (Hebeloma) decoratus, pileus subviscid, fleshy, undulating-expanded with paler umbo, at first covered with woolly pale yellow veil, then with concentric squamules, stipe subflexuous, hollow, annulate, fusiform, rooting, striate, pale yellow-wood colour with pruinose apex; lamellae emarginate-adnexed, not spotted, white then pale cinnamon colour. Among grass in woodland-meadow on the hill Svarte Gärdet in Råda parish near Lidköping, abundant, late Sept. 1845. Pileus 5 cm and more wide. Stipe 7.5–10 cm long, 1–1.5 cm wide. Pileus when young with marginal veil at first densely woolly, like in Cortinarius turmalis and C. lanigerus. Mature pileus with concentric velar squamules, young, and later also in rainy weather, slightly, and often indistinctly viscid, more or less undulating-expanded, turning to brown, especially when young, but centre paler, more yellowish. Stipe first pale yellowish-wood colour, then very strongly brown striate, very often with blunt annulus (often distinctly biannulate). Lamellae absolutely not spotted, under lens poorly, finely ciliate. Smell weakly hebelomatoid.

Commentary: Described as having a very strong woolly veil on the pileus, which has a paler umbo, and with a rooting stipe and weak smell. If it were a Hebeloma it would belong to Hebeloma sect. Scabrispora. However, we cannot think of any known taxon from that section that would be described as having a “strong woolly veil”, so we consider it unlikely that this is a Hebeloma species.