Placoasterella Sacc. ex Theiss. & Syd., Annls mycol. 13(3/4): 236 (1915).
MycoBank number: MB 4121; Index Fungorum number: IF 4121; Facesoffungi number: FoF 08117; 4 morphological species (Species Fungorum 2020), molecular data unavailable.
Type species: Placoasterella schweinfurthii (Henn.) Theiss. & Syd., Annls mycol. 13(3/4): 236 (1915).
≡ Asterella schweinfurthii Henn., Bull. Herb. Boissier 1: 118 (1893).
Notes: Placoasterella was erected with two species. Another two species were introduced with their family placement in Asterinaceae (Müller and von Arx 1962). Hongsanan et al. (2014b) re-examined holotype of P. schweinfurthii and transferred the genus to Parmulariaceae based on morphology. Placoasterella is characterized by superficial, circular, flat, black, carbonaceous ascostromata with small, solitary, subglobose locules, lacking pseudoparaphyses, ovoid asci and ellipsoid to fusoid ascospores with one septum (Hongsanan et al. 2014b).