Coprinus bisporiger Buller ex P.D.Orton (1976) Coprinellus bisporiger Redhead, Vilgalys, Moncalvo (2001) Tulosesus bisporiger is a species of mushroom producing fungus in the family Psathyrellaceae.

[1] It was first described by the English mycologist Peter Darbishire Orton in 1976 and placed in the Coprinus genus.

In 2001, a phylogenetic study resulted in a major reorganization and reshuffling of that genus and this species was transferred to Coprinellus.

[2] The species was known as Coprinellus bisporiger until 2020 when the German mycologists Dieter Wächter & Andreas Melzer reclassified many species in the Psathyrellaceae family based on phylogenetic analysis.

[3] This Psathyrellaceae article is a stub.