Russula sardonia Fr. Zitronenbättriger Täubling, Russule âcre, Russule à couleur de sardoine, Primrose Brittlegill.
Cap 4–10cm across, convex, later flattening and with a depression, violet-, purplish- or brownish-red, greenish or ochre to yellowish, hard, shortly peeling only. Stem 30–80 x 10–15mm, sometimes white but usually entirely pale lilac to greyish rose, firm; surface as if powdered. Flesh white. Taste very hot, smell slightly fruity. Gills adnexed to slightly decurrent, at first primrose, later pale golden yellow, narrow. Gills and flesh reacting rose with ammonia (distinguishes this species). Spore print cream (C–F). Spores ovoid with warts up to 0.5µ high, joined into ridges or by fine lines to form a rather poorly developed network, 7–9 x 6–8µ. Cap cystidia spindle-shaped or cylindrical, without septa, strongly reacting to SV. Habitat under pine. Season summer to autumn. Frequent. Found In Europe and western north America. Edibility suspect-not advisable.