Halotestudina
Halotestudina Dayarathne & K.D. Hyde, in Dayarathne et al., Mycosphere 11(1): 69 (2020).
Index Fungorum number: IF 556584; Facesoffungi number: FoF 06170, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on mangrove wood. Sexual morph: Ascomata subglobose, completely or partially immersed, carbonaceous to coriaceous, black, gregarious, ostiolate. Peridium coriaceous to carbonaceous, two-layered, outer layer composed of elongate cells, inner layer composed of smaller hyaline cells. Hamathecium comprising trabeculate pseudoparaphyses, unbranched at the base, anastomosing above the asci, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, cylindrical, long-pedicellate, with a refractive non-amyloid, apical ring. Ascospores biseriate, ellipsoidal to broadly fusiform, muriform, pale brown to brown, with hyaline to pale brown apical cells, glabrous, with a gelatinous cap or a mucilaginous sheath. Asexual morph: Unknown (adapted from Dayarathne et al. 2020).
Type species: Halotestudina muriformis Dayarathne & K.D. Hyde
Notes: Halotestudina differs from similar genera in Testudinaceae in having brown muriform ascospores that are constricted at each septum. In the phylogenetic analyses of Dayarathne et al. (2020), Halotestudina shows a close phylogenetic affinity to Trematosphaeria and Angustospora. However, Halotestudina differs from these two genera in that Trematosphaeria has trabeculate hamathecium surrounded by a gelatinous matrix and reddish-brown ellipsoid to fusoid transversely septate ascospores occasionally with paler end cells (Boise 1985, Barr 1990b, Mckeown et al. 2001) and Angustospora has large ascospores with a median septum and an extra septum near the poles of the ascospores (Li et al. 2016). Halotestudina is both morphologically and phylogenetically a distinct genus in Testudinaceae. Molecular markers available for Halotestudina are LSU, SSU, RPB2 and TEF-1.
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