Pleosporales » Phaeosphaeriaceae

Dlhawksworthia

Dlhawksworthia Wanas., Camporesi & K.D. Hyde, in Wanasinghe et al., Index Fungorum 357: 1 (2018)

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

Index Fungorum number: IF 554390; Facesofungi number: FoF 04021

Etymology: In honour of David Leslie Hawksworth, for his immense contribution to mycology.

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.

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

Notes: Hyde et al. (2016) introduced Dematiopleospora alliariae as the third Dematiopleospora species. But in a multi-gene phylogenetic analyses (Hyde et al. 2016, Huang et al. 2017), D. alliariae is not strongly supported as a taxon in Dematiopleospora. Also, D. alliariae differs from the Dematiopleospora species in having ascomata with a crest-like ostioles and uni-seriate ascospores with 3(–4) transverse septa. According to morpho-molecular analyses, Wanasinghe et al. (2018) introduced the novel genus, Hawksworthiana to accommodate three Hawksworthiana species. Currently, Hawksworthiana has nomenclatural change as Dlhawksworthiana.

 

References:

 

Huang S, Jeewon R, Wanasinghe DN, Manawasinghe et al. 2017 – Phylogenetic taxonomy of Dematiopleospora fusiformis sp. nov. (Phaeosphaeriaceae) from Russia. Phytotaxa 316, 239–249.

Hyde KD, HongsananS, Jeewon R, Bhat DJ et al. 2016 –  Fungal diversity notes 367–490: taxonomic and phylogenetic contributions to fungal taxa. Fungal diversity 80, 1–270.

Wanasinghe DN, Phukhamsakda C, Hyde KD, Jeewon R et al. 2018 – Fungal diversity notes 709–839: taxonomic and phylogenetic contributions to fungal taxa with an emphasis on fungi on Rosaceae. Fungal diversity 89, 1–236.

 

Last Update: 05 May 2021

 

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