Pleosporales » Cyclothyriellaceae

Massariosphaeria

Massariosphaeria (E. Müll.) Crivelli, Diss. Eidgenöss. Techn. Hochschule Zürich 7318: 141 (1983).

            ≡ Leptosphaeria subgen. Massariosphaeria E. Müll., Sydowia 4(1-6): 206 (1950).

Index Fungorum number: IF 25819; Facesoffungi number: FoF 08194, 20 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on host. Sexual morph: Ascomata scattered, globose to conical, immersed, subcuticular to subepidermal, becoming erumpent, beak papillate, conical to longitudinally compressed with a circular or slit-like ostiole. Asci bitunicate, numerous, clavate-cylindrical, short-stalked, thick-walled. Ascospores phragmoseptate, sometimes with longitudinal septa, hyaline to brown, fusiform-ellipsoid or clavate. Asexual morph: Aposphaeria-like (adapted from Crane & Shearer 1991).

 Type species: Massariosphaeria phaeospora (E. Müll.) Crivelli

Notes: Müller (1950) segregated several species of Leptosphaeria with large, thick-walled ascospores surrounded by a thick gelatinous sheath into the subgenus Massariosphaeria. Crivelli (1983) raised the subgenus to genus rank and expanded the generic concept to include dictyosporous taxa. Crivelli (1983) formally established Massariosphaeria with M. phaeospora as type species. Massariosphaeria is characterised by globose to conical, immersed ascomata with a circular or slit-like ostiole, clavate-cylindrical, short-stalked asci and phragmoseptate, sometimes with longitudinal septa, hyaline to brown, fusiform to ellipsoid or clavate ascospores (Tanaka & Harada 2004, Van 2005, Wang et al. 2007). Wang et al. (2007) reported that Massariosphaeria is polyphyletic. In the phylogenetic analysis of several authors (Wang et al. 2007, Hyde et al. 2013, Jaklitsch & Voglmayr 2016), M. phaeospora was closely related to Cyclothyriella rubronotata and hence, was included in Cyclothyriellaceae. Massariosphaeria is morphologically and phylogenetically a distinct genus in Cyclothyriellaceae. More taxa with sequence data are needed to confirm the status of the genus as molecular data is available for only one species. Molecular markers available for Massariosphaeria are ITS, LSU, SSU, RPB2 and TEF-1.

 

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