Growth of Trichophyton mentagrophytes and Trichophyton rubrum in Increased Carbon Dioxide Tensions

Summary: The formation of macrospores in normally mycelial strains of Trichophyton mentagrophytes and T. rubrum was induced by growing the cultures in a gas phase containing air + 12–24% (v/v) CO2. When conidial transfers were made from strains which had thus been induced to form macrospores and were incubated in normal air, the subsequent growth was mycelial and downy. One strain of each fungus, normally conidial and granular, formed arthrospores under increased CO2.