Dematiomelanomma Wanas., Y. Gao, H. Gui & K.D. Hyde, 2023

Gao, Ying, Zhong, Tingfang, Bhat, Jayarama D., Gomes de Farias, Antonio Roberto, Dawoud, Turki M., Hyde, Kevin D., Xiong, Weiqiang, Li, Yunju, Gui, Heng, Yang, Xuefei, Wu, Shixi & Wanasinghe, Dhanushka N., 2023, Pleomorphic Dematiomelanomma yunnanense gen. et sp. nov. (Ascomycota, Melanommataceae) from grassland vegetation in Yunnan, China, MycoKeys 98, pp. 273-297 : 273

Dematiomelanomma Wanas., Y. Gao, H. Gui & K.D. Hyde gen. nov.

Etymology.

The generic epithet comes from combining the words Dematio and Melanomma , meaning brown spores in Melanommataceae .

Description.

Saprobic on dead woody stalks. Sexual morph: Ascomata solitary or gregarious, superficial, black, globose to subglobose, ostiolate. Ostiole central, papillate or apapillate, filled with hyaline cells. Peridium multi-layered, comprising cells of textura angularis. Hamathecium comprising of hyaline, filamentous, branched or unbranched, septate pseudoparaphyses. Asci eight-spored, bitunicate, fissitunicate, cylindrical to cylindric-clavate, with a pedicel, rounded and thick-walled at apex, with an ocular chamber. Ascospores uniseriate, sometimes overlapping, muriform, ellipsoidal to fusiform, narrowly rounded at ends, initially hyaline, becoming brown at maturity, with transverse septum appearing first, later becoming vertically septate, smooth-walled, with a mucilaginous sheath. Asexual morph: Synanamorphic. Conidiomata pycnidial, solitary or gregarious, mostly superficial, obpyriform, dark brown to black, ostiolate. Ostiole single, circular, centrally papillate with periphyses. Conidiomatal wall multi-layered, thick-walled, dark brown, composed of cells of textura angularis, inner layer with hyaline cells. Macroconidiogenous cells enteroblastic, annellidic, integrated, indeterminate, doliiform, smooth-walled, hyaline, arising from the innermost layer of pycnidial wall. Macroconidia medium brown to dark brown, ellipsoidal to fusiform, phragmosporous to muriform, curved to straight. Microconidiogenous cells present or absent in cultures; when present, hyaline, integrated, enteroblastic, percurrently annellidic, ampulliform to subcylindrical. Microconidia present or absent; when present, hyaline, round to oblong or ellipsoidal, with small guttules.

Type species.

Dematiomelanomma yunnanense Y. Gao, Wanas., H. Gui & K.D. Hyde.