Russula fellea

Species typical of both broadleaf and coniferous forests, with a preference for beechwoods, with a convex to applanate pileus 4 to 10 cm in diameter, ochraceous yellow; white spore print; hollow stipe paler than the pileus; applesauce odor and scorching, burning acrid taste.

Cuticle filamentous, formed by intermixed hyphae 2.5 to 3.5 µm wide, with numerous emergent hyphal terminations acting as pileocystidia 3 to 8 µm wide, containing abundant matter turning blackish grey in sulphovanillin, septate with simple septa.

Cheilocystidia cylindrical to fusiform, 30 to 60 µm long and 6 to 9 µm wide.

Pleurocystidia similar, 50 to 90 µm long, 8 to 10 µm wide; both cheilocystidia and pleurocystidia containing copious blackish-grey intracellular pigment.

Basidia clavate, 35 to 45 µm long, 8 to 10 µm wide, simple-based and four-spored.

Spores subglobose to ellipsoidal, with warts up to 1 µm high, 7.5 to 9.5 µm long, 6 to 8 µm wide, ornamented with numerous warts connected by fine ridges, without forming a complete reticulum.