Cystolepiota potassiovirens is a species of mushroom producing fungus in the family Agaricaceae.

[1][2] It was described in 1989 by the German mycologist Rolf Singer who classified it as Cystolepiota potassiovirens.

Spores: Ellipsoidal without a germ pore, hyaline, non-amyloid but greenish in KOH.

[4] This is in reference to the green colouration the spores develop in Potassium Hydroxide (KOH).

The specimens studied by Singer were found growing solitary or gregariously on the ground in the tropical forests of Brazil, 30km North of Manaus.