Russula mustelina

CAP 8-12 mm in diam., obtusely convex to plano-convex then broadly
depressed, often highly irregular, margin undulating, surface smooth to slightly striate
or sulcate, varying from yellow to pale brown-yellow to mottled red and yellow or varying
shades of brown, sometimes with green tones, not bruising. GILLS adnate to adnexed,
free with age, not forked, white at first, then yellow with age. STEM 40-95 mm tall x
20-30 mm wide, equal to clavate, glabrous, solid, compact, white, sometimes bruising pale
brown when handled. ODOR mild to not distinct. TASTE mild to not distinct. PILEIPELLIS
two layered, epicutis a tangled to interwoven layer of hyphae, subcutis of interwoven
gelatinous hyphae. PILEOCYSTIDIA present although sometimes rare. CYSTIDIA rare to
numerous, 51-107 x 7-14 μm, fusoid to cylindric with obtuse apices or a narrow, elongated,
terminal appendage. SPORES subglobose to subovoid to subellipsoid, 7-6-10.5 x 6.5-9 μm,
ornamentation of low isolated warts, heavy ridges and fine lines, sometimes forming a
broken reticulum, thin walled, spore print creamy to yellow.