T. aegyptiacus T. aurantiacus T. crustaceus T. taitungiacus T. thermophilus T. verrucosus T. yaguchii Thermoascus is a genus of soil fungi in the family Trichocomaceae.

Thermoascus was circumscribed by German botanist Hugo Miehe in 1907.

[1] The type species, Thermoascus aurantiacus, is of research interest because it secretes heat-resistant hydrolase enzymes that could possibly be used in biotechnological applications, such as the conversion of biomass to biofuels.

[2] Genetic tools have been developed to genetically edit Thermoascus aurantiacus, such as an Agrobacterium tumefaciens-mediated transformation protocol and a CRISPR-Cas9 gene editing system, which have been used to overexpress genes that correspond to production of enzymes that break down plant matter and inactivate genes.

[3] Another described species, Thermoascus isatschenkoi Malchevskaya (1939),[8] is considered doubtful due to a lack of examinable material and an incomprehensive description.