Westerdykella Stolk, Trans. Br. Mycol. Soc. 38 (4): 422 (1955)

Index Fungorum number: IF5772;

Westerdykella typified by W. ornata, is characterized by cleistothecioid ascomata, small, short pedicellate asci encasing one-celled, verruculose ascospores, without germ slits (Kruys & Wedin 2009). The genus has a cosmopolitan distribution and have been isolated from various substrates such as dung, mud, plant material and soil (Clum 1955, Cain 1961, Malloch & Cain 1972, Ito & Nakagiri 1995). Westerdykella produce phoma-like asexual morphs in culture (Sue et al. 2014, Crous et al. 2017b). To date, 13 species have been described within Westerdykella (Index Fungorum 2020). Abdel-Aziz (2016) reported Westerdykella species in freshwater habitats. An updated phylogeny for the genus is provided in Fig. 14.

Phylogram generated from maximum likelihood analysis based on combined LSU and ITS sequence data. Seventy-six strains are included in the combined analyses which comprised 1380 characters (877 characters for LSU, 503 characters for ITS) after alignment. Tree topology of the maximum likelihood analysis is similar to the Bayesian analysis. The best RaxML tree with a final likelihood value of -4024.762813 is presented. Estimated base frequencies were as follows: A = 0.243185, C = 0.237776, G = 0.280053, T = 0.238986; substitution rates AC = 0.948333, AG = 1.449700, AT = 1.765595, CG = 0.630050, CT = 4.794304, GT = 1.000000; gamma distribution shape parameter a = 0.199782. Bootstrap support values for ML greater than 65% and Bayesian posterior probabilities greater than 0.90 are given near nodes respectively. The tree is rooted with Preussia longisporopsis (Lundqvist 16551-g) and Preussia intermedia (UPS:Kruys 304). Ex-type strains are in bold and black. The newly generated sequences are indicated in yellow.