Hypholoma fasciculare

sulphur tuft

Scientific identification: Hypholoma fasciculare (Huds.) P.Kumm.
Family: Strophariaceae
Class: Agaricomycetes
Genus: Hypholoma

Names across languages

English: sulphur tuft
German: Grünblättriger Schwefelkopf
Finnish: Kitkerälahokka
Estonian: Sälk-kollanutt
Russian: Ложноопёнок серно-жёлтый

The scientific profile

From the latest record: 2026-06-21.

Hymenium

Gills crowded, adnate; sulphur-yellow when young, becoming olive-green, then dark purplish-brown to blackish

Cap

Convex to broadly convex or nearly flat; sulphur-greenish-yellow, darker orange-brown in centre; smooth, dry, sometimes with small veil fragments at margin

Hymenium Attachment

Adnate to attached

Stipe

Slender, cylindrical, often curved; yellow to tawny, browner toward base; partial veil evanescent, sometimes leaving a faint fibrillose ring zone

Spore print

Spore print purple-chocolate-brown

Ecology

Saprobic on dead wood, stumps, fallen trunks, buried roots and logs of hardwoods and conifers, often in dense clustered tufts, mainly summer to autumn

Edibility

Poisonous, severe gastrointestinal poisoning

Fruit body

Fruit body small to medium, stipe ~3–12 cm long, ~0.4–1.0 cm thick

Dimensions

Cap ∅ ~2–7 cm

Flesh

Flesh thin, sulphur-yellow, firm, unchanging when cut

Chemical reactions

KOH: No distinctive macroscopic field reaction documented; spores yellowish in KOH microscopically

Odour

Mushroomy but indistinct

Taste

Very bitter

Microscopy

Spores ellipsoid, smooth, thin-walled, with germ pore, ~5–8 × 3–4.5 µm; pleurochrysocystidia fusoid-ventricose to mucronate; pileipellis a cutis or ixocutis with encrusted elements