Phaeoisaria  Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 118: 330 (1909)

Index Fungorum number: IF 9305

Phaeoisaria, typified by P. bambusae, comprises 30 epithets in Index Fungorum (2020). Phaeoisaria is characterized by dark brown to black synnemata, polyblastic conidiogenous cells and ellipsoidal to obovoidal conidia (Luo et al. 2019). Phaeoisaria species form a well-supported clade in Pleurotheciaceae (Luo et al. 2019), but the sequences of the type species P. bambusae are still unavailable. An updated phylogeny for the genus is provided.

Phylogram generated from maximum likelihood analysis based on combined LSU, SSU and ITS sequence data. Twenty-six strains are included in the combined analyses which comprised of 2343 characters (843 characters for LSU, 871 characters for SSU, 629 characters for ITS) after alignment. For all the gene regions, GTR+I+G was applied as the evolutionary model. Tree topology of the maximum likelihood analysis is similar to the Bayesian analysis. The best RaxML tree with a final likelihood value of -9202.581935 is presented. Estimated base frequencies were as follows: A = 0.234130, C = 0.255242, G = 0.295085, T = 0.215543; substitution rates AC = 2.002438, AG = 2.838660, AT = 2.153563, CG = 0.815836, CT = 8.189358, GT = 1.000000; gamma distribution shape parameter a = 0.167151. Bootstrap support values for ML greater than 80% and Bayesian posterior probabilities greater than 0.95 are given near the nodes respectively. The tree is rooted with Savoryella aquatica (SS 03801). Ex-type strains are in bold and black. The newly generated sequence is indicated in yellow.