Pleosporales » Phaeosphaeriaceae

Yunnanensis

Yunnanensis Karun., Phookamsak & K.D. Hyde, in Karunarathna et al., Mycosphere 8(10): 1823 (2017).

Index Fungorum number: IF 553842; Facesoffungi number: FoF 03725, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Saprobic on dead grass stems in terrestrial habitats. Sexual morph: Ascomata gregarious to scattered, immersed to erumpent through the host surface, globose to subglobose, dark brown to black, unilocular, with indistinct ostiole. Peridium thin to thick-walled, of equal thickness, composed of 3–5 layers of pseudoparenchymatous cells, outer layers comprising thick-walled cells, dark brown to black, arranged in a textura angularis, inner layers comprising hyaline cells of textura angularis to textura prismatica. Hamathecium composed of dense, filamentous, cellular pseudoparaphyses, distinctly septate, embedded in a hyaline gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, broadly cylindrical to cylindric-clavate, short pedicellate, with obtuse pedicel, apically rounded, with a well-developed ocular chamber. Ascospores overlapping 1–2- seriate, phragmosporous to muriform, fusiform to ellipsoidal, widest at the central cells, pale yellowish when young, becoming golden brown at maturity, 3 transverse septa, and 1 longitudinal septum in the 2nd and 3rd cells, constricted at the central septum, rounded to acute at both ends, rough-walled, finely verruculose, surrounded by a thick, hyaline, mucilaginous sheath. Asexual morph: Coelomycetous. Conidiomata, solitary, immersed to erumpent, dark brown to black, globose to subglobose, slightly depressed, unilocular, lacking ostiole. Pycnidial walls composed of 4–5 layers of thin-walled, brown to dark brown pseudoparenchymatous cells of textura angularis, inner layer with hyaline cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, integrated to discrete, doliiform, lageniform or cylindrical, smooth, hyaline, thin-walled, arising from the basal cavity. Conidia ellipsoidal to obovoid, truncate at the base, obtuse at the apex, muriform, brown to dark brown at maturity, 3 transverse septa, with 1 longitudinal septum at the 2nd and the 3rd cell, continuous or constricted at the septa, rough-walled (adapted from Karunarathna et al. 2017).

 Type species: Yunnanensis phragmitis Karun. & K.D. Hyde

Notes: Yunnanensis is characterised by gregarious to scattered, immersed to erumpent ascomata, broadly cylindrical to cylindric-clavate 8-spored asci and phragmosporous to muriform, fusiform to ellipsoidal ascospores. Yunnanensis resembles Phaeosphaeria in having globose to subglobose ascomata with thick peridium comprising an outer layer of textura angularis and inner layer of textura prismatica, bitunicate, fissitunicate asci and muriform ascospores surrounded by a mucilaginous sheath but differs in that the asexual morph of Yunnanensis has muriform conidia. Yunnanensis also resembles Muriphaeosphaeria but Yunnanensis has ellipsoidal to obovoid, muriform conidia while Muriphaeosphaeria has cylindrical to subclavate, phragmosporous conidia (Phukhamsakda et al. 2015, Karunarathna et al. 2017). Yunnanensis is phylogenetically related to Neosetophoma but is morphologically distinct in having muriform ascospores with a mucilaginous sheath. Yunnanensis also resembles Allophaeosphaeria and Dematiopleospora in having muriform ascospores. Yunnanensis differs from Allophaeosphaeria in having ascomata comprising pseudoparenchymatous cells, with indistinct ostiole while the latter has ascomata with scleroplectenchymatous or pseudoparenchymatous cells as well as a distinct ostiole (Liu et al. 2015). Yunnanensis differs from Dematiopleospora in that the latter has ascospores with light end cells and ascomata with neck comprising light brown apical setae which is lacking in Yunnanensis. Yunnanensis is morphologically and phylogenetically a well-defined genus in Phaeosphaeriaceae. Molecular markers available for Yunnanensis are ITS, LSU, SSU and TEF-1.

 

Recent News

Recent paper to be published

Recent Genus

Nothocladosporium
Phillipsiella
Curreya

Recent Species

Nothocladosporium syzygii
Phillipsiella atra
Curreya conorum