Murramarangomycetaceae Crous, in Crous et al., Persoonia 39: 385 (2017).
MycoBank number: MB 823434; Index Fungorum number: IF 823434; Facesoffungi number: FoF 08088, 7 species.
Leaf spots, associated with several fungi in a leaf spot colony, confined to one side of the leaf. Mycelium interepidermal, brown, septate, branched, giving leaf spots a red- purple appearance without any superficial mycelium being present, mycelium aggregating in substomatal cavity. Sexual morph: Thyrothecium superficial, radial orientation or clusters, circular, flattened, with lobed, brown, smooth to irregular margin of cells of textura epidermoidea or angularis. Hamathecium comprising hypha-like, dissolving at maturity, or persistent, hyaline, septate, anastomosing or not, pseudoparaphyses. Asci 8-spored, ellipsoid-obclavate, pedicellate, with small ocular chamber. Ascospores 3- to multi-seriate, fusoid-ellipsoid to obovoid, 1-septate, guttulate, granular, slightly constricted at median septum or not, encased in prominent mucoid sheath which is absent at maturity, hyaline, becoming brown once discharged onto agar. Asexual morph: Hyphomycetous. Hypophyllous, circular, dark brown. Mycelium in vitro consisting of hyaline, smooth hyphae, irregular, constricted at septa. Conidiogenous cells thick-walled cells that become fertile conidiogenous cells, aggregated in cauliflower-like clusters of brown, doliiform to globose, brown conidiogenous cells, phialidic, giving rise to solitary conidia. Conidia in slimy mass, aseptate, hyaline, smooth, bacilliform (adapted from Crous et al. 2017, 2019c).
Type: Phaeothyriolum Syd.
Notes: This family was introduced by Crous et al. (2017) to accommodate the monotypic genus, Murramarangomyces which contains a single species, M. corymbiae. Phylogenetic analyses indicated that Murramarangomycetaceae is different from other families and orders within Dothideomycetes, therefore, Crous et al. (2017) established a new order to accommodate this family. However, Murramarangomyces was synonymised under Phaeothyriolum by Crous et al. (2019c). Murramarangomycetaceae and Murramarangomycetales accommodates Phaeothyriolum base on the Phaeothyriolum clade not clustering with any other families and orders in Dothideomycetes. Seqeuence data of the type species of Phaeothyriolum is needed.