Mitrulinia is a fungal genus of uncertain familial placement in the order Helotiales.

[3] Mitrulinia populations have been found separately in Argentina and on the South Island of New Zealand.

[4] Spores or hyphal fragments were also found present in snow on Livingston Island, Antarctica.

[5] Individuals found in New Zealand are thought to belong to a novel species rather than Mitrulinia ushuiae.

[6] It produces a stipitate-capitate ascocarp (a fruiting body) arising from a substratal or sclerotial stroma tissue.