Russula claroflava Grove. Yellow Swamp Russula, Gelber Graustieltäubling, Krómsárga galambgomba, Gele berkerussula.
Cap 4–10cm across, convex, with a depression later, yellow to ochre yellow, fairly fleshy, slightly sticky, shining, less so when dry, peeling halfway; margin finally furrowed. Stem 40–100 x 10–20mm, white, soft but not fragile. Flesh white. Taste mild or slightly hot. Gills adnexed to almost free, palish ochre. All parts becoming dark grey on bruising or when old. Spore print pale ochre (F). Spores ovoid with warts up to 1µ high, joined by numerous fine lines to form a fairly well-developed network, 9–10 x 7.5–8µ. Cap surface without cystidia; numerous hyphae with encrustations staining in fuchsin present. Habitat under birch, especially on wet ground. Season autumn, sometimes late spring to early summer. Frequent. Edible. (Never eat any mushroom until you are certain it is edible as many are poisonous and some are deadly poisonous) Distribution, America and Europe.