Psilocybe hoogshagenii is a species of psilocybin mushroom in the family Hymenogastraceae. The mushroom has a brownish conical or bell-shaped cap up to 3 cm (1.2 in) wide that has an extended papilla up to 4 mm long. The stem is slender (up to 3 mm thick) and 5 to 9 cm (2.0 to 3.5 in) long. The variety P. hoogshagenii var. convexa lacks the long papilla.