Black Piedra is caused by:
Black piedra Caused by Piedraia hoae Gross-Discrete black, gritty, hard nodules on the hair of the scalp Dx- 10% KOH mount of the crushed nodule reveals dark septate hyphae with club shaped asci, each containing 2-8 ascospores
Pityrosporum orbiculare
Exophiala
Trichosporon beigelii
Piedraia hoae
Mycology