Moser Cortinarius sublargus is a species of fungus in the family Cortinariaceae native to Australia.

[2] Cleland also described Cortinarius radicatus in 1933 from material collected in Willunga Hill, Waitpinga, Mount Lofty, Mount Compass, and Kinchina,[3] Though Cleland regarded them as distinct,[4] later authorities determined them to be the same species.

[5] William Murrill named an American species Cortinarius sublargus in 1939, though renamed it C. largiformis in 1944 as it too was a homonym.

[6] The basidiocarp (mushroom) has a white to cream cap that can be sticky when wet and grows to 15 cm (6 in) across.

The adnate to decurrent gills are white when young, turning red-brown with age as the spores mature.