Woswasiaceae H. Zhang, K.D. Hyde & Maharachch., Fungal Divers. 85: 104 (2017)

Index Fungorum number: IF553769; 3 species.

Saprobic, hypersaprotrophic on stromata of Diaporthe in freshwater or terrestrial habitats. Sexual morph: Ascomata perithecial, scattered, aggregated or in groups, stromatic or astromatic, immersed to erumpent, globose, subglobose or ellipsoid, coloured, sometimes seated in a stroma or basal stroma. Neck or papilla centrally located, cylindrical, upright or slightly horizontal to the substrate, pale brown, dark brown to black. Ostiolum periphysate. Peridium leathery to fragile, two- or three-layered. Paraphyses abundant, persistent, septate. Asci 8-spored, unitunicate, cylindrical or fusoid, with a distinctive, J-, apical ring. Ascospores uniseriate or overlapping uni-seriate, hyaline, globose, subglobose, ellipsoidal or fusiform, unicellular or septate, thin- or thick-walled, verruculose or smooth-walled, with or without a gelatinous sheath. Asexual morph: Coelomycetous, produced in culture with or without sporodochial conidiomata. Conidiophores aggregated, hyaline to subhyaline, with a clavate or penicillate head or conidiogenous cells developing from hyphae. Conidiogenous cells monoblastic or polyblastic, sympodially proliferating, terminal, cylindrical, hyaline. Conidia ellipsoid to obovoid, hyaline, aseptate, smooth-walled (adapted from Raja et al. 2003, Jaklitsch et al. 2013, Réblová et al. 2014, Zhang et al. 2017).

Type genus Woswasia Jaklitsch, Réblová & Voglmayr

NotesWoswasiaceae was introduced by Zhang et al. (2017) and placed in Diaporthomycetidae, families incertae sedis (Jaklitsch et al. 2013, Réblová et al. 2014, Senanayake et al. 2016, Zhang et al. 2017a). The family presently contains three genera, Cyanoannulus, Woswasia and Xylochrysis. The family status was strongly supported in the MCC tree, which has a stem age at ca 115 MYA (Hyde et al. 2017a, Zhang et al. 2017a).

Ecological and economic significance of Woswasiaceae: Woswasiaceae currently includes three taxa isolated from decaying wood (Zhang et al. 2017). They may be important decomposers participating in nutrient cycling, especially on submerged and dry wood.

Figure – Phylogram generated from maximum likelihood analysis based on combined LSU, SSU, ITS and rpb2 sequence data of Diaporthomycetidae. One hundred and ninety-three strains are included in the combined analyses which comprised 3545 characters (859 characters for LSU, 972 characters for SSU, 659 characters for ITS) after alignment. Single gene analyses were carried out and the topology of each tree had clade stability. Tree topology of the maximum likelihood analysis is similar to the Bayesian analysis. The best RaxML tree with a final likelihood value of – 68207.368884 is presented. Estimated base frequencies were as follows: A = 0.248206, C = 0.241993, G = 0.285500, T = 0.224301; substitution rates AC = 1.369088, AG = 2.887040, AT = 1.413053, CG = 1.152137, CT = 6.303994, GT = 1.000000; gamma distribution shape parameter a = 0.315782. Bootstrap support values for ML greater than 75% and Bayesian posterior probabilities greater than 0.95 are given near the nodes. The tree is rooted with Diatrype disciformis (AFTOL-ID 927). Ex-type strains are in bold. The newly generated sequences are indicated in blue.