Tetraploa Berk. & Broome, Ann. Mag. nat. Hist., Ser. 2 5: 459 (1850).

= Tetraplosphaeria Kaz. Tanaka & K. Hirayama, Studies in Mycology 64: 177 (2009).

MycoBank number: MB 10199; Index Fungorum number: IF 10199; Facesoffungi number: FoF 06666; 15 morphological species (Species Fungorum 2020), 8 species with molecular data (Hyde et al. 2020b).

Type speciesTetraploa aristata Berk. & Broome, Annals and Magazine of Natural History 5: 459 (1850).

NotesTetraploa is the type genus of Tetraplosphaeriaceae, introduced by Berkeley & Broome (1850) based on T. aristate. Tanaka et al. (2009) introduced sexual morph genus Tetraplosphaeria with Tetraploa sensu stricto asexual morphs observed from culture. The sexual morph is characterized by globose to subglobose, glabrous ascomata with short-papillate to cylindrical beak, fissitunicate, cylindrical to clavate, short-stalked, 8-spored asci, and fusiform, hyaline, 1-septate ascospores with mucilaginous appendage-like sheath. (Tanaka et al. 2009). Asexual morph is characterized by micronematous conidiophores, monoblastic conidiogenous cells, and short-cylindrical, brown conidia with 4 setose appendages at the apex and conidia composed of 4 columns (Ellis 1971, Tanaka et al. 2009). Tetraploa species have usually been reported saprobic on herbaceous plants or rotten wood (Ellis 1949, Révay 1993), while they can also be isolated from soil or raindrops (Ando 1992, Watanabe 2002).