Piedraia is a genus of fungus within the Piedraiaceae family in the Capnodiales order.
There are 2 known species (according to Species Fungorum); Piedraia hortae Piedraia quintanilhae
Former species; P. hortae var. paraguayensis = Piedraia hortae P. javanica = Piedraia hortae P. malayi = Piedraia hortae P. sarmentoi = Piedraia hortae P. surinamensis = Piedraia hortae P. venezuelensis = Piedraia hortae
Piedraia hortae is responsible for causing black piedra.
References