Roridomyces austrororidus, commonly known as the austro dripping bonnet, is a species of agaric fungus in the family Mycenaceae.

Described as new to science in 1962 by American mycologist Rolf Singer, it is found in South America, New Zealand, and Australia, where it grows on rotting wood.

The species was first described as Mycena austrororida by mycologist Rolf Singer in 1962, based on specimens he collected from Masatierra, in the Juan Fernandez Islands, Chile.

[6] The specific epithet combines the Latin words austro (from australis, "south")[7] and roridus ("wet with dew").

The cap margin is curved downward, sometimes slightly flared, and sometimes has translucent radial striations marking the positions of the gills underneath.

They have a small, oblique apiculus, lack oil droplets, and are smooth with thin walls, and hyaline (translucent).

Australian mycologist Tony Young suggests that the geographical distribution of the fungus indicates that its ancestor may have originated from the ancient continent Gondwana.