Pleosporales » Phaeosphaeriaceae


Dlhawksworthia Wanas., Camporesi & K.D. Hyde, in Wanasinghe et al., Fungal Diversity: 10.1007/s13225-018-0395-7, [121] (2018).

Index Fungorum number: IF 554390; Facesoffungi number: FoF 04021, 3 morphological species (Species Fungorum, 2022), 3 species with molecular data.

Saprobic in terrestrial habitats. Sexual morph: Ascomata immersed to erumpent, solitary, scattered, globose or subglobose, dark brown to black, coriaceous, ostiolate. Ostiole papillate, blackish brown, smooth, comprising brown cells. Peridium with 2–3 layers, comprising heavily pigmented, thin-walled, brown to dark brown cells of textura angularis. Hamathecium comprising numerous, filamentous, branched, septate, pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, pedicellate, thick-walled at the apex, with minute ocular chamber. Ascospores overlapping uniseriate, ellipsoidal, muriform, upper part wider than the lower part, 2–4-transversely septate, with 1 vertical septa, constricted at the central septum, initially hyaline, becoming yellowish-brown at maturity, ends remaining lighter and cone-shaped, with rounded ends. Asexual morph: Conidiomata pycnidial, solitary, scattered, subepidermal to immersed, erumpent at maturity, globose, unilocular, brown. Ostiole apapillate, single, circular, central. Conidiomata wall composed of two layers, outer layer thick, composed of thin-walled, brown cells of textura angularis, inner layer thin, hyaline, almost reduced to conidiogenous region. Conidiophores reduced to conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, ampulliform to rarely lageniform, discrete, determinate, hyaline to pale brown, smooth. Conidia ellipsoidal or rarely slightly sigmoid, straight to slightly curved, both ends rounded or base rarely truncate, phragmosporous, 4–5- transversely septate, with 1–2 vertical septa, constricted at septa, often with small guttules, thick and smooth-walled (Adapted from Wanasinghe et al., 2018).


Type species: Dlhawksworthia alliariae (Thambug., Camporesi & K.D. Hyde) Wanas. & K.D. Hyde


Notes: Dlhawksworthia was introduced by Wanasinghe et al. (2018) with H. alliariae as type species. Dlhawksworthia is characterized by immersed to erumpent, solitary, globose or subglobose, dark brown to black, coriaceous, ostiolate ascomata, cylindrical to cylindric-clavate asci and ellipsoidal, muriform ascospores. Dlhawksworthia alliariae was previously introduced as D. alliariae by Hyde et al. (2016) but was not congeneric with the type species of Dematiopleospora. D. alliariae differs from other Dematiopleospora species in having ascomata with a crest-like ostioles and uni-seriate ascospores with 3(–4) transverse septa.  In the phylogenetic analysis of Wanasinghe et al. (2018), D. alliariae forms a strongly supported distinct monophyletic lineage. Hence, Dlhawksworthia was erected to accommodate three strains namely H. alliariae, H. clematidicola and H. lonicerae. Dlhawksworthia is morphologically and phylogenetically a well-defined genus in Phaeosphaeriaceae. Molecular markers available for Dlhawksworthia include LSU, SSU, ITS and TEF1 sequence data.


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