Stropharia aeruginosa (Curt. ex Fr.) Quél. Grünspanträuschling Strophaire vert-de-gris, Vert-de-gris, Verdigris Agaric. Cap 2–8cm across, convex to bell-shaped then flattened and slightly umbonate, blue to blue-green from the gluten and flecked with white scales, becoming pale yellowish as this is lost. Stem 40–100 x 4–12mm, whitish to blue, apex smooth, covered in small whitish scales below the spreading membranous ring. Flesh whitish-blue. Smell none. Gills white then clay brown, often with a white edge. Cheilocystidia obtuse, clavate-capitate or lageniform capitate; lanceolate chrysocystidia found on gill face and only rarely on gill-edge. Spore print brownish-purple. Spores elliptic, 7–10 x 5um. Habitat woods, heaths and pastures. Season late spring to late autumn. Common. Poisonous. Distribution, America and Europe.