Collemopsidiales Pérez-Ort.

MycoBank number: MB 815627; Index Fungorum number: IF 815627; Facesoffungi number: FoF 07652.

This recently erected order includes a single family, Xanthopyreniaceae. It encompasses species of lichen-forming fungi, lichenicolous or forming loose associations with cyanobacteria. The diversity of the order has been largely underestimated and the actual number of species could exceed 200. The divergence time for Collemopsidiales is estimated as 230 MYA (stem age, Hongsanan et al. 2020) (Fig. 27).

Accepted families: Xanthopyreniaceae

Fig. 27 Phylogram generated from maximum likelihood analysis (RAxML) of Collemopsidiales based on LSU and SSU sequence data. Maximum likelihood bootstrap values equal or above 70%, Bayesian posterior probabilities equal or above 0.90 (MLBS/PP) are given at the nodes. An original isolate number is noted after the species name. The tree is rooted to and Abrothallus cladoniae (AB53) and A. parmeliarum (AB36). Hyphen (-) represents support values below 70% MLBS and 0.90 PP