Hygrophorus persoonii

A species associated with Quercus on calcareous soils, formerly known as Hygrophorus dichrous.

Pileipellis with a superficial layer of filamentous hyphae, 2-6 µm wide, widely separated by gelification, with greenish intracellular pigment and abundant encrusting pigment of the same color on their surface.

Cystidia and other sterile hymenial elements absent.

Lamellar trama bilateral.

Basidia clavate, 45-70 µm long and 8-12 µm wide, with basal clamps, 4-spored.

Spores ellipsoidal, smooth, hyaline, thin-walled, with a clearly visible eccentric apiculus at one end, one or more oil or lipid droplets inside, inamyloid in Melzer's reagent.