Microsporum gallinae (originally identified as Epidermophyton gallinae) is a type of fungi known as dermatophyte, which have the ability to utilise keratin as a nutrient source, i.e. they have a unique enzymatic capacity [keratinase]. It is responsible for causing dermatophytosis (tinea or favus aka ringworm) in chickens.
Distribution: M. gallinae is found worldwide, however is more abundant in tropical and subtropical regions. It's optimal temperature for growth is between 26 to 28 °C (78 to 82 °F). M. gallinae seeks keratin-rich nutrients found on chicken's skin and nails.