Aspergillus calidoustus is a species of fungus in the section Ustus, which grows at 37 °C (formerly called A. ustus, a species that fails to grow at 37 °C) and exhibits high minimal inhibitory concentrations to azoles.

It is considered an agent of opportunistic infection.

[1][2][3] Colonies can appear white and progress to brownish-yellow.

Curved conidiophores and Hülle cells can be identified.

The conidia are echinulated (spiny).