Mauritiana
Mauritiana Poonyth, K.D. Hyde, Aptroot & Peerally, Fungal Diversity Res. Ser. 4: 102 (2000).
Index Fungorum number: IF 28416; Facesoffungi number: FoF 08249, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on dead decorticated wood. Sexual morph: Ascomata globose to obovoid, immersed beneath thin, brown, noncoriaceous fungal tissue. Ostiole central, periphysate. Peridium pseudostromatic, composed of several layers of thick-walled, elongated cells. Pseudoparaphyses filamentous, branched, septate, abundant. Asci 8-spored, bitunicate, cylindrical to cylindric-clavate, dextrinoid (IKI (lugol)+brown), apex rounded, with an ocular chamber. Ascospores smooth, fusiform, with rounded ends, hyaline to very pale brown, 9-13-distoseptate, non-amyloid (IKI-), septa thick, with dark pigmentation, slightly constricted at middle septum. Asexual morph: Unknown (adapted from Poonyth et al. 2000).
Type species: Mauritiana rhizophorae Poonyth,K.D. Hyde, Aptroot & Peerally
Notes: Mauritiana is characterised by globose to obovoid ascomata, pseudostromatic peridium, cylindrical to cylindric-clavate asci, and hyaline to very pale brown ascospores. Poonyth et al. (2000) placed Mauritiana in the Pyrenulales sensu stricto (Melanommatales sensu lato, Dothideales sensu lato) based on the immersed ascomata, interascal tissue comprising branched pseudoparaphyses, cylindric-clavate asci and brown, septate ascospores constricted at the middle septum. Boise (1986) suggested that Mauritiana is closely related to genera in Requienellaceae based on the distoseptate, dextrinoid ascospores and the broad cellular pseudoparaphyses. Mauritiana resembles Passeriniella Berl. but can be differentiated in that the latter has immersed ascomata below a thin stroma with erumpent ostiole neck while Mauritiana has immersed ascomata below a thin layer of non-coriaceous fungal tissue and a short neck opening on the surface of the host (Hyde & Mouzouras 1988). Mauritiana is morphologically and phylogenetically a distinct genus in Halotthiaceae. Molecular markers available for Mauritiana are LSU, SSU, GAPDH, RPB2 and TEF-1.
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