Which feature is used to identify Zygomycetes in clinical microbiology?

• A. Presence of rhizoids
• B. Septate hyphae with clamp connections
• C. Yeast-like budding
• D. Sclerotia formation

Answer: (A)

Morphological clues under the microscope guide identification of Zygomycetes, and the most useful feature here is the presence of rhizoids. These root-like hyphae anchor the mold to the substrate and are a hallmark of Zygomycetes (notably seen with genera like Rhizopus). When rhizoids are observed alongside the characteristic broad, non-septate hyphae and sporangiophores, it strongly points to Zygomycetes rather than other fungi such as yeasts (which bud) or molds with clamp connections or other structures. Other features listed correspond to different fungal groups and don’t define Zygomycetes, so the rhizoids stand out as the best identifying clue in clinical specimens.