Pseudojahnula
Pseudojahnula W. Dong, H. Zhang & K.D. Hyde, in Dong et al., Fungal Diversity: 10.1007/s13225-020-00463-5, [34] (2020).
Index Fungorum number: IF 557824; Facesoffungi number: FoF 07689, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on submerged wood. Sexual morph: Ascomata solitary or gregarious, erumpent, become superficial with base remaining immersed, subglobose, obpyriform or almost conical, hyaline and then metallic grey, coriaceous, with ostiolate papilla, with algal associations. Peridium comprising several layers of relatively large, hyaline, thin-walled, angular cells and covered with sparse hyaline hairs. Pseudoparaphyses numerous, trabeculate, filamentous, hyaline, septate, unbranched between the asci, branching and anastomosing above. Asci 8-spored, bitunicate, fissitunicate, obclavate, pedicellate, with an ocular chamber and faint ring. Ascospores bi- to tri-seriate near the base, overlapping uniseriate near the apex, l-septate, light brown, ellipsoid fusiform, surrounded by a mucilaginous sheath, which is wavy in outline. Asexual morph: Unknown (adapted from Dong et al. 2020).
Type species: Pseudojahnula potamophila (K.D. Hyde & S.W. Wong) W. Dong, H. Zhang & K.D. Hyde
Notes: Pseudojahnula is characterised by subglobose, obpyriform or almost conical ascomata, fissitunicate, obclavate, pedicellate asci, and ellipsoid fusiform ascospores surrounded by a mucilaginous sheath. P. potamophila previously known as Jahnula potamophila, is not congeneric with the type species of Jahnula and clustered in a separate lineage in phylogenetic analyses (Huang et al. 2018, Dong et al. 2020). Pseudojahnula resembles Ascagilis in ascospore size, but can be differentiated based on the narrow mucilaginous sheath which is wavy in outline (Hyde & Goh 1999, Hyde & Wong 1999, Dong et al. 2020) but is phylogenetically distinct. Pseudojahnula differs from Jahnula in having hyaline to metallic grey ascomata, a several-layered peridium consisting of hyaline cells and enclosed with few hyaline hairs, obclavate asci with an ocular chamber with a faint ring, and ascospores encircled by a wavy mucilaginous sheath (Hyde & Wong 1999, Dong et al. 2020). Pseudojahnula is morphologically and phylogenetically a distinct genus in Aliquandostipitaceae. LSU and SSU DNA sequence data are available for Pseudojahnula. More collections and data from more gene region will help to confirm the status of the genus in Aliquandostipitaceae.
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