Stemonitis is a distinctive genus of slime moulds found throughout the world (except Antarctica).

They are characterised by the tall brown sporangia, supported on slender stalks, which grow in clusters on rotting wood.

[2] The genus was first described by German botanist Johann Gottlieb Gleditsch in 1753.

[3] Identification within the genus is difficult, and can only be performed with confidence using a microscope or by DNA sequencing.

A fossil specimen (in Burmese amber) is known from the mid-Cretaceous (99 ma).