What You Should Know
Tricholomopsis sulphureoides is a wood-decomposing fungus growing on Picea and Abies trunks in old-growth coniferous forests. It has a small number of localities in the temperate and boreal forests of Europe and North America. Its habitat is in decline due to clearcutting, however, there is no evidence of population decline, and the status in boreal Asia is unclear. Grew in temperate and boreal zones of eastern and western North America (Canada, USA) and Europe (France, Estonia, Poland, Slovakia, Spain, UK). Only one Asian locality is known from China (UNITE).
Tricholomopsis sulphureoides is a species of fungi in the group Basidiomycota, first described by Charles Horton Peck, and given the simplified Asian name by Rolf Singer in 1943. Tricholomopsis sulphureoides belong to the genus Tricholili of the Tricholomataceae.
Tricholomopsis sulphureoides Mushroom Identification
Saprobic on the wood of conifers, especially hemlocks—or on the wood of hardwoods undergoing a brown rot; usually growing gregariously or in clusters; summer and fall; more common in the Great Lakes region and northeastern North America than elsewhere, but occasionally reported in the Rocky Mountains, the southeastern United States, and on the West Coast.
2–6 cm; at first convex with an incurved margin, becoming broadly convex or flat; dry; subtomentose when young, becoming finely scaly to stretched-fibrillose overall, with a subtomentose marginal zone; bright yellow when fresh, but soon fading to dull yellow and developing whitish spots and streaks; bruising slightly brownish in places.
Broadly attached to the stem; close; short-gills frequent; yellow to yellowish-orange.
4–8 cm long; 0.5–1 cm thick; equal; dry; slightly fibrillose in places; pale yellow, staining orangish where handled; basal mycelium pale yellow.
Yellow to pale yellow; turning slightly brownish in places when sliced.
Odor and Taste
Odor fragrant; taste is not distinctive.
KOH instantly dark brownish-red on the cap surface.
Spores 5–6 x 4–5.5 µm; subglobose to sublacrymoid, with a tiny apiculus; smooth; hyaline in KOH; inamyloid. Cheilocystidia 40–75 x 5–7.5 µm; cylindric with rounded to subclavate apices; smooth or occasionally finely encrusted; thin-walled; hyaline to orangish in KOH. Pleurocystidia not found. Lamellar trama parallel. Pileipellis a cutis with aggregated upright tufts; orange-brown in KOH; elements smooth, 2.5–5 µm wide; terminal cells cylindric with rounded apices. Clamp connections are present in lamellar trama and pileipellis.
Tricholomopsis sulphureoides Synonyms
Agaricus sulphureoides Peck 1872
Dendrosarcus sulphureoides (Peck) Kuntze 1898
Pleurotus sulphureoides (Peck) Sacc. 1887
Tricholomopsis ornata sulphureoides (Peck) Singer, 1943
Tricholomopsis osiliensis Vauras, 2009
Tricholomopsis sulphureoides megaspora A. H. Sm., 1960
Tricholomopsis sulphureoides sulphureoides (Peck) Singer, 1943
Tricholomopsis sulphureoides var. sulphureoides (Peck) Singer 1943
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Photo 3 - Author: Jason Hollinger (Creative Commons Attribution 2.0 Generic)
Photo 4 - Author: Jason Hollinger (Creative Commons Attribution 2.0 Generic)