Mesniera
Mesniera Sacc. & Syd., Syll. Fung. 16: 440 (1902).
Index Fungorum number: IF 3134; Facesoffungi number: FoF 07872, 3 morphological species (Species Fungorum 2022), no molecular data available.
Parasitic on leaves, causing necrotic patches, or saprobic. Sexual morph: Ascomata densely gregarious, immersed in yellowish-green necrotic patches, with radial arrangement, ring or spirals with progressively younger ascomata towards periphery, apically opening with a pore, or widened and large hole in mature ascomata. Peridium thin-walled, hyaline, composed of flattened cells arranged in a textura angularis. Hamathecium comprising numerous, hypha-like, hyaline, filamentous, septate pseudoparaphyses. Asci 12–16-spored, bitunicate, cylindrical to clavate, short pedicellate, lacking an ocular chamber or apical ring. Ascospores crowded, ovoid to ellipsoidal, dark brown, 1- celled, without a mucilaginous sheath. Asexual morph: Unknown (adapted from von Arx & Müller 1975, Eriksson 1981).
Type species: Mesniera rottlerae (Racib.) Sacc. & P. Syd.
Notes: Mesniera is characterised by ascomata immersed in yellowish-green necrotic patches, cylindrical to clavate, short pedicellate asci and ovoid to ellipsoidal, dark brown, 1-celled ascospores without a mucilaginous sheath. Based on the observations of Eriksson (1981), Mesniera has a concentric ring of ascomata in necrotic patches, wide pores comprising mature asci with ascospores, and mature ascomata present on both the upper and lower side of the leaves. The type specimen of Mesniera rottlerae (≡ Anthostomella rottlerae) seems to be lost (Hyde et al. 2013, Hongsanan et al. 2020b). Mesniera needs re-collecting and neotypifying.
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