Appearance
PileusCap 30-75 mm broad, obtuse-conic becoming convex to plano-convex, with or without a low umbo; margin decurved to level at maturity, obscurely striate; surface moist, finely wrinkled, (use hand lens) dark brown to dark olive brown at disc, paler towards margin; context relatively thin, up to 5 mm thick near disc, watery dull yellow; taste mild; odor not distinctive.
Lamellae
Gills free, close, cream-colored, becoming pale yellow, developing pinkish tones in age, relatively broad, up to 7 mm in width; edges fringed (use hand lens); lamellulae in two to three series
Stipe
Stipe 20-50 x 5-10 mm in width, round, with a pith-like core, equal to slightly enlarged below; surface finely striate, cream-colored, becoming pale yellow to yellow; partial veil absent.
Habitat
Found in ones and twos on well-rotted logs, branches, and debris of hardwoods such as oaks (Quercus spp., and Tanbark oak (Notholithocarpus densiflorus), occasionally with conifers; known from coastal forests and likely present in the Sierra Nevada; fruiting from late fall to mid-winter; fairly commonReferences:
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https://www.mykoweb.com/CAF/species/Pluteus_romellii.html