Parathyridaria
Parathyridaria Jaklitsch & Voglmayr, Stud. Mycol. 85: 48 (2016).
Index Fungorum number: IF 817775; Facesoffungi number: FoF 08377, 5 morphological species (Species Fungorum 2022), 5 species with molecular data.
Saprobic on host. Sexual morph: Ascomata more or less globose, black, immersed in wood and bark, wood surface stromatised, grey to black, subiculum absent or inconspicuous. Peridium pseudoparenchymatous. Ostiolar necks discoid, less commonly papillate or short-cylindrical, apices black or light-colored, ostioles periphysate. Hamathecium of numerous sparsely branched, trabeculate pseudoparaphyses. Asci bitunicate, fissitunicate, narrowly clavate, with a small but distinct ocular chamber, a short stipe and simple or furcate base, containing 8 ascospores biseriately arranged at upper levels. Ascospores fusoid, with several eusepta and rarely a longitudinal septum, pale to greyish brown, not darkening in 3 % KOH, upper part or second cell often slightly broader than lower part, smooth, guttulate, sheath absent. Asexual morph: (inferred from cultures of P. percutanea): Pycnidia black, globose to subglobose, with thin pseudoparenchymatous wall. Conidiogenous cells hyaline, phialidic. Conidia small, ellipsoid, unicellular, hyaline to pale brown (adapted from Jaklitsch & Voglmayr 2016).
Type species: Parathyridaria ramulicola Jaklitsch, Fourn. & Voglmayr
Notes: Parathyridaria is characterised by globose, black, immersed ascomata, discoid ostiolar neck, narrowly clavate asci and fusoid ascospores with several eusepta. The asexual morph is characterised by black, globose to subglobose pycnidia, hyaline, phialidic conidiogenous cells and small, ellipsoid, unicellular, hyaline to pale brown conidia. Parathyridaria is unique in having discoid ostiolar apices and pale to greyish brown ascospores that do not turn dark in 3% KOH. Parathyridaria is morphologically and phylogenetically a distinct genus in Thyridariaceae. Molecular markers available for Parathyridaria are ITS, LSU, SSU, RPB2 and TEF-1.
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