Tremateia
Tremateia Kohlm., Volkm. -Kohlm. & O.E. Erikss., Bot. Mar. 38(2): 165 (1995).
Index Fungorum number: IF 6202; Facesoffungi number: FoF 00223, 6 morphological species (Species Fungorum 2022), 6 species with molecular data.
Saprobic on dead wood in marine habitats. Sexual morph: Ascomata solitary, scattered, brown to black, immersed in the host tissue, globose to subglobose. Peridium composed of two layers, outer layer composed of irregular, thick-walled, brown cells of textura angularis. The inner layer composed of hyaline, larger cells of textura angularis. Hamathecium dense of cellular, septate long, hyaline pseudoparaphyses. Asci 4–8-spored, bitunicate, clavate to broadly clavate, short pedicellate, thin-walled, apically rounded with a broad ocular chamber. Ascospores uniseriate or biseirate, asco, constricted at central septum, with 2- layered cells, sometimes rounded at both sides with a 15–25 μm wide, large uniform sheath. Asexual morph: Phoma-like (adapted from Kohlmeyer et al. 1995 and Ariyawansa et al. 2014).
Type species: Tremateia halophila Kohlm., Volkm. -Kohlm. & O.E. Erikss.
Notes: Tremateia is characterised by scattered, brown to black, globose to subglobose ascomata, clavate to broadly clavate asci and ellipsoid to fusiform, light brown to brown, muriform ascospores surrounded by a large uniform sheath. Tremateia has a Phoma-like asexual stage (Kohlmeyer et al. 1995). Kohlmeyer et al. (1995) referred Tremateia to Pleosporaceae based on the morphological characters above. In the phylogenetic analyses of Ariyawansa et al. (2014) using a combined dataset of LSU, ITS, SSU and EF1-α sequences, Tremateia formed a distinct lineage in Montagnulaceae sister to Bimuria novae-zelandiae and confirmed the placement of the genus in Montagnulaceae now known as Didymosphaeriaceae. Feng et al. (2019) added Tremateia murispora to Tremateia. Tremateia is morphologically and phylogenetically a distinct genus in Didymosphaeriaceae. Molecular markers available for Tremateia are ITS, LSU, SSU, BTUB, RPB2 and TEF-1.
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