Scientific name: Hypholoma fasciculare (Hudson:Fries)
Derivation of name: Fascicul- means "bundle" referring
the clustered or bundled growth habit of this species.
Synonyms: Naematoloma fasciculare (Huds.) P.
Common name(s): Sulphur tuft
Occurrence on wood substrate: Saprobic; in clusters
deciduous or conifer logs, stumps, or surrounding soil
buried wood; May through November.
Dimensions: Caps are 2-8 cm wide; stipes are 5-12 cm
and 1.5-10 mm thick.
Cap: Smooth; moist or dry; orange-yellow to sulphur-
Gills: Attached; sulphur-yellow to greenish yellow,
pale purple-brown at maturity.
Spore print: Purple-brown.
Veil: Partial veil leaves a fibrous zone near the stalk apex
which may become purple-brown following deposition of
Comments: Causes gastric distress.
More information at MushroomExpert.com:
Figure 1. Clusters of sulphur tufts on a log.
Photo © Larry Grand.
The gills on these young specimens are still
yellowish. They will become darker as the spores mature.
Photo © William Roody.
Figure 3. The lower portions of the stipes are typically darker.
Photo © John Plischke III.