Piedraia Fonseca & Leão, Mem. Inst. Oswaldo Cruz 4(Suppl.): 125 (1928)
Index Fungorum number: IF 4098; Facesoffungi number: FoF 06139, 2 morphological species (Species Fungorum 2021), 2 species with molecular data.
Pathogen of human hair. Sexual morph: Ascostromata consisting of pseodoparenchymatic tissue, scattered singly on the underlying part of primate hairs, variable in shape and size, but usually flat, elongated with a rough surface, dark in colour, multi-loculate in section, containing numerous cavities, irregularly distributed throughout. Each locule becomes erumpent as the asci mature, and can be seen as small dimple, and contains a single ascus. Pseudostiolate locules, without pseudoparaphyses, with paraphysoids. Asci 8-spored, bitunicate, subglobose to broadly ellipsoidal. Ascospores 1-celled, hyaline, rarely light yellowish or greenish, without septa, thin-walled, fusiform, curved, more or less straight to falcate, tapering toward both ends, with tapering gelatinous appendages or without appendages. Germination by several germ tubes. Asexual morph: Undetermined (Adapted from Hyde et al. 2013).
Type species: Piedraia hortae Fonseca & Leão
Notes: Piedraia was introduced by Fonseca and Leão (1928) with P. hortae as type species. Piedraia is a filamentous fungi and cause infection of hairs and forms hard nodes on hair shafts. The infection caused by Piedraia results in the development of asymptomatic brown to black nodules which comprise of ascostromata enclosing asci and aseptate ascospores. Piedraia is a well distinct genus accommodated in its own family Piedraiaceae.