Jarxia
Jarxia D. Hawksw., Stud. Mycol. 31: 93 (1989).
Index Fungorum number: IF 25310; Facesoffungi number: FoF 07879, 2 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on dead plant. Sexual morph: Ascomata perithecial, small, solitary, scattered, immersed becoming erumpent, finally superficial, globose to subglobose, top rounded, black to dark brown, membranous, surrounding by septate, dark brown, irregular, branched hyphae, with a short, central ostiole. Peridium thick, composed of one layer of hyaline to brown cells of textura angularis. Hamathecium of gelatinous, hyaline, septate, cellular pseudoparaphyses. Asci 8-spored, bitunicate, clavate, with an ocular chamber. Ascospores elongate-ellipsoid, uniseptate, smooth-walled, upper cell larger but lower cell longer, occasionally guttulate, constricted at the septum, gelatinous sheath not observed. Asexual morph: Unknown (adapted from Doilom et al. 2018).
Type species: Jarxia thelenula (Müll. Arg.) D. Hawksw.
Notes: Jarxia is characterised by globose to subglobose, top rounded, black to dark brown ascomata, bitunicate, clavate asci and elongate-ellipsoid, uniseptate, smooth-walled ascospores. Doilom et al. (2018) examined the syntype of Jarxia thelenula and accepted Jarxia in Naetrocymbaceae. Jarxia differs from Naetrocymbe, Leptorhaphis and Tomasellia in having superficial ascomata while the other three genera have immersed, subglobose and dark brown ascomata, 8-spored, ellipsoid and apically rounded asci with an ocular chamber. Jarxia is a distinct genus in Naetrocymbaceae but lacks molecular data. Fresh collections with DNA sequence data are needed to confirm the placement of Jarxia.
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