Ascomycota, genera » incertae sedis

Dothiorina

Dothiorina Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 120: 464 (1911)

Facesofungi number: FoF 07323

Ascomycota, genera incertae sedis

 

Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata greenish to brownish and fleshy when moist, becoming black and carbonaceous when dried, stromatic, pycnidial, sessile, scattered to gregarious or confuent, immersed to superfcial or erumpent through bark, subspherical to moriform, plurilocular, with numerous irregularly oval or pyriform pycnidial locules at diferent levels, glabrous, ostiolate. Ostiole single to each locule, circular, centrally located. Conidiomatal wall composed of thin-walled, gelatinous anastomosing, dark brown to black cells of textura oblita in the exterior, becoming somewhat parallel, greenish to light brown cells in the inner locular wall. Conidiophores arising from the innermost layer cells of the locular wall, hyaline to subhyaline, subcylindrical to irregular, repeatedly branched, septate, with granular ornamentation towards the base. Conidiogenous cells hyaline, enteroblastic, phialidic, with long, cylindrical necks and cylindrical to slightly ampulliform venter, integrated, determinate, tapered at the apices, smooth-walled. Conidia hyaline, in chains, cylindrical to allantoid, produced by ring wall building within phialides, forming basipetal chains of up to five conidia into the necks, unicellular, smooth-walled, guttulate (Sutton 1980; Nag Raj 1977a, b; Sánchez and Bianchinotti 2007).

 

Type species: Dothiorina tulasnei (Sacc.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 120: 464 (1911)

 

Notes: von Höhnel (1911) introduced Dothiorina to accommodate a single species D. tulasnei, a fungus collected on fallen branches of Nothofagus pumilio (Nothofagaceae) from Argentina. Dothiorina is characterized by glabrous, plurilocular conidiomata with numerous irregularly pycnidial locules at diferent vertical levels and unusual conidiogenesis (ontogeny enteroblastic by ring wall building within phialides, forming basipetal chains of up to five conidia into the cylindrical necks) (Sánchez and Bianchinotti 2007). Two additional species have been added to the genus namely, D. discoidea (von Höhnel 1925) and D. subcarnea (Riedl 1977). Sánchez andBianchinotti (2007) revised the genus and excluded D. discoidea, because of its distinct morphology of conidiomata and conidiogenous cells (setose, cupuliform conidiomata, phialides with periclinal thickening and solitary conidia). Dothiorina subcarnea was regarded as a doubtful taxon as the type material was lost. Thus, only the generic type is accepted in Dothiorina. The sexual morph of Dothiorina tulasnei was generally considered as Chlorociboria aeruginascens (Nyl.) Kanouse ex C.S. Ramamurthi et al. (Berthet 1964; Dixon 1975; Hanlin 1997; Nag Raj 1977a, b; Sutton 1980; Gamundí et al. 2004). According to this connection, Johnston et al. (2014) preserved Chlorociboria as generic name over the older name Dothiorina, as Chlorociboria is a well-known name. However, the connection between Chlorociboria and Dothiorina was only based on the proximity of apothecia and conidiomata on natural substratum and it has never been successfully demonstrated in culture (Sánchez and Bianchinotti 2007). Thus, we keep Dothiorina as a legitimate name, as does Kirk et al. (2013), until molecular data becomes available.

 

Distribution: Argentina, Austria, USA (Sanchez et al. 2007).

 

Dothiorina tulasnei (redrawn from 1977a) a Conidia. b Conidiophores, conidiogenous cells and developing conidia. c Vertical section of conidiomata.

 

Reference:

 

Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.

 

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