Colonies white, reverse white to light gray, rapidly growing in BDA, filling the entire Petri dish (9 cm) after five days at 29 °C. Sporangiophores simple or sympodially branched 4.5–11 μm diam. Sporangia 20–75 × 20–70 μm, light yellow. Columellae 15–35 (–45,6) × 13–30 (–33,52) μm, globose to ellipsoid, pyriform, some conical; collar evident. Sporangiospores ellipsoid 3.5–11 × 3–10 μm. Zigosporangia. Chlamydospores observed present on the aerial mycelia.

There are several records worldwide of this species. We suggest it as Least Concern (LC).

worldwide spread (19 countries). In Brazil, it is known in 3 of the 26 states.

There are about 58 records of this species in GBIF.

This species is distributed worldwide and has been isolated from soil, insects, fruits, honeycomb, limestone, and plasticized polyvinylchloride (Sabev et al. 2006)

In Brazil, M. fragilis has been reported from soil of Atlantic Forest, seeds of maize, and from Duponchelia fovealis (Lepidoptera).

Schipper MA. On certain species of Mucor with a key to all accepted species. Stud Mycol 1978;17:1-52.