Colonies are very fast growing at 25°C, about 5 - 8 mm high, with some tendency to collapse, white cottony initially becoming brownish grey to blackish - grey depending on the amount of sporulation.
Sporangiophores up to 1500 um in length and 18 um in width, smooth walled, non - septate, simple or branched, arising from stolons opposite rhizoids usually in groups of 3 or more. Sporangia are globose, often with a flattened base, grayish black, powdery in appearance, up to 175 um in diameter and many spored.
For identification, isolates are usually inoculated at three points on Czapek Dox agar and 2% Malt extract agar and incubated at 25C. Most species sporulate within 7 days. Microscopic mounts are best made using a cellotape flag or a slide culture preparation mounted in lactophenol cotton blue. A drop of alcohol is usually needed to remove bubbles and excess conidia