page_title: Aspergillus ustus
section_title: Morphology and physiology
hierarchical_section_title: Aspergillus ustus / Identification and taxonomy / Morphology and physiology
caption_attribution_description: English: J Scott, personal photo, Hulle cell and conidia of Aspergillus ustus group (probably A. puniceus), grown on Modified Leonian's agar and photographed in Nomarski Differential Interference Contrast microscopy
context_page_description: Aspergillus ustus is a microfungus and member of the division Ascomycota. It is commonly found in indoor environments and soil. Isolated cases of human infection resulting from A. ustus have been described; however the majority of these are nail infections.
context_section_description: Colonies of A. ustus appear dull brown sometimes with a purplish to grey brown or dark brown with a yellow to brown reverse side; colonies are flat to furrowed often with a cental bump. Microscopically, the fungus is characterized by elongated conidial heads with bent Hülle cells scattered throughout the pigmented mycelium.  The conidia are rough-walled and spherical, ranging in color from green to yellow-brown. The vesicles range from 7–15 μm in diameter and are hemispherical to almost round.  Although A. ustus is able to grow at human body temperature, other species in this group, such as A. baeticus and A. pseudoustus, require relatively low temperature for growth and thus are unlikely to cause human infection.
caption: Hülle cell and conidia of A. ustus group.
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