Microsporum audouinii is an anthropophilic fungus in the genus Microsporum.It is a type of dermatophyte that colonizes keratinized tissues (primarily hair) causing infection. The fungus is characterized by its spindle shaped macroconidia (7-30 × 35-160 µm), clavate microconidia (2.5-3.5 × 4-7 µm) as well as its pitted or spiny external walls.