Black piedra is caused by ?
Ans. is 'a' i.e., Piedraia hoae Piedra is an asymptomatic superficial fungal infection of the hair shaft also known as trichomycosis nodu- laris. Black piedra is caused by Piedraia hoae, whereas white piedra is caused by pathogenic species of the Trichosporon genus, namely Trichosporon asahii, Trichosporon ovoides, Trichosporon inkin, Trichosporon mucoides, Trichosporon asteroides, and Trichosporon cutaneum.
Piedraia hoae
Trichosporon asahi
Trichosporon ovoides
Trichosporon inkin