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Rhizomucor pusillus

Microscopic morphology of Rhizomucor pusillus showing sympodially branched sporangiophores with a septum below the sporangium.  Sporangia are generally globose with an oval or pear-shaped columella.  A collarette (remnants of the sporangial wall) is usually visible at the base of the columella following spore dispersal.  Sporangiospores are globose to subglobose and are often mixed with crystalline remnants of the sporangial wall.  Rhizomucor species are thermophilic and differ from species of Mucor by the development of primitive rhizoids.