Sporangiophores that are singularly produced or branched and have at their tip a round sporangium filled with sporangiospores and the absence of rhizoids or stolons would usually indicate infection with

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Rhizopus has unbranched sporangiophores with rhizoids that appear at the point where the stolon arises, at the base of the sporangiophore. In contrast, Mucor is characterized by sporangiophores that are singularly produced or branched and have at their tip a round sporangium filled with sporangiospores. It does not have rhizoids or stolons; this distinguishes it from the other genera of Zygomycetes. Absidia, an uncommon isolate in the clinical laboratory, is characterized by the presence of rhizoids that originate between sporangiophores. The sporangia of Absidia are pyriform and have a funnel-shaped area at the junction of the sporangium and the sporangiophore. Usually a septum is formed in the sporangiophore just below the sporangium.

Sporangiophores That Are Singularly Produced or Branched and Have at Their