Figure 50-45 Mucor spp., showing numerous sporangia without rhizoids (430x).
base of the sporangiophore (see Figure 50-43). 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 (Figure 50-45). Absidia, an uncommon isolate in the clinical laboratory, is characterized by the presence of rhizoids that originate between sporangiophores (Figure 50-46). The sporangia of Absidia are pyriform and have a funnel-shaped area (apophysis) at the junction of the sporangium and the sporangiophore. Usually a septum is formed in the sporangiophore just below the sporangium. Other genera of Zygomycetes that are encountered much less frequently in the clinical laboratory include Rhizomucor, Saksenaea, Cunninghamella, Apophysomyces,87 Conidiobolus, and Basidiobolus.,n
Serology is not useful for the diagnosis of zygomycosis.
662 PartV MYCOLOGY
Figure 50-46 Absidia spp. <A) showing sporangia on long sporangiophores arising from pauciseptate hyphae (B). Note that rhizoids are produced between sporangiophores and not at their bases (250x).
HYALINE, septate, monomorphic molds: the dermatophytes
Genera and Species to Be Considered—Trichophyton, Microsporum, and Epidermophyton
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