Hysteropatella
Hysteropatella Rehm, Rabenhorst’s Kryptogamen-Flora, Pilze - Ascomyceten 1(3): 367 (1890).
Index Fungorum number: IF 2469; Facesoffungi number: FoF 00351, 7 morphological species (Species Fungorum 2022), 3 species with molecular data.
Saprobic on bark of Malus domestica, rarely on Prunus sp. and Pyrus communis in terrestrial habitats. Sexual morph: Ascomata hysterothecial, gregarious, erumpent to superficial, persistent dark, carbonaceous, boat-shaped with longitudinal slit. Exciple 2-layers, composed of small pseudoparenchymatous cells, the outer layer heavily encrusted with pigments and the inner layer distinctly thin-walled, pallid and compressed. Hamathecium comprising cellular, cylindrical, branched pseudoparaphyses, embedded in a gelatinous matrix, darkened at the apex at maturity, forming a dark epithecium over the asci. Asci 8–spored, bitunicate, cylindrical to clavate, pedicellate, slightly swollen at the apex. Ascospores 2-seriate overlapping, reniform to ellipsoid or fusoid, phragmosporous, 3–septate at maturity, constricted at the septa, occasionally surrounded by a sheath, and often show bipolar asymmetry, ranging from hyaline to dark brown. Asexual morph: Unknown (adapted from Yacharoen et al. 2015).
Type species: Hysteropatella prostii (Duby) Rehm.
Notes: Hysteropatella is characterised by hysterothecial, gregarious, erumpent to superficial ascomata, cylindrical to clavate asci and reniform to ellipsoid or fusoid, phragmosporous ascospores. Eriksson (2006) tentatively included Hysteropatella in Hysteriaceae. In the phylogenetic analysis of Schoch et al. (2009) based on five genes, SSU, LSU, TEF1, RPB1 and RPB2, H. clavispora and H. elliptica clustered close to Patellaria atrata in Patellariaceae. Hyde et al. (2013) accepted Hysteropatella in Patellariaceae based on available evidence. Yacharoen et al. (2015) studied the holotype specimen of H. prostii (G: No.53) and accepted Hysteropatella in Patellariaceae. Hysteropatella is a distinct genus in Patellariaceae. Molecular markers available for Hysteropatella are ITS, LSU, SSU, RPB2, TEF-1 and mtSSU.
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