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Key to Rhizopus including Rhizomucor
1. Spores irregular, angular, subspherical, oval R. parasiticus
1. Spores spherical, smooth or echinulate but not angular 2
2. Columella conical or subcylindric, (black tongue) R.niger
2. Columella ovoid or piriform, pathogen for rabbit 3
3. Chlamydospores not produced R. rhizopodiformis
3. Chlamydospores present R. equinus