A key is given to the known species of the genus Westerdykella Stolk: W. dispersa (Clum) Cejp et Milko comb. nov. (Pycnidiophora dispersa Clum), W. semeonovii Milko, W. multispora (Saito et Minoura) Cejp et Milko comb. nov. (Anixiopsis multispora Saito et Minoura), and W. ornata Stolk, followed by their descriptions and distribution. The genus is characterized by 32 ascospores per ascus and associated imperfect stages like Darluca, parasitic on rusts.
Cejp K., Milko A. A. (1964): Genera of the Eurotiaceae with 32 ascospores-I. Westerdykella. – Česká Mykologie 18(2): 82–84.