Julella Fabre, Annls Sci. Nat., Bot., sér. 6, 9: 113. 1879 (1878).
Index Fungorum number: IF 2539; MycoBank number: MB 2539; Facesoffungi number: FoF 00038; 6 morphological species (Species Fungorum 2020), 1 species with molecular data.
Saprobic or possibly lichenized. Sexual state: Ascomata immersed, becoming erumpent to nearly superficial, sphaeroid, black, coriaceous, ostiolate, formed under a clypeus. Ostiole usually widely porate, with a short neck, ostiolar canal filled with periphyses. Peridium two-layered, outer wall composed of small, dark brown to black, heavily pigmented, thick-walled cells of textura angularis and fusing with the host tissue to the outside, inner wall comprising broad yellowish-brown cells of textura angularis, thick at the apex and thinner at the base. Hamathecium of dense broad, septate, cellular, pseudoparaphyses anastomosing and branching and embedded in mucilage. Asci 2-spored, bitunicate, fissitunicate, clavate to cylindrical, with a short, broad, furcated or knob-like pedicel, rounded at apex and without a distinct ocular chamber. Ascospores biseriate or partially uniseriate, asymmetric or nearly symmetric, hyaline, obovoid, fusoid, or elongate, multi-septate, muriform, verruculose, thin-walled, surrounded by a mucilaginous sheath, guttulate, constricted at the septa. Asexual state: unknown.
Type species – Julella buxi Fabre, Annls Sci. Nat., Bot., sér. 6, 9: 113. (1878).
Notes – Julella was introduced by Fabre (1879) with Julella buxi as the type species collected from Buxus sempervirens L. (Buxaceae). Julella species are compatible with Didymosphaeriaceae in having immersed ascomata formed under a clypeus, short neck, 2-layered peridium composed of cells of textura angularis and cylindric or oblong, pedicellate, often with an ocular chamber and oblong to narrowly oblong muriform ascospores but differing in having hyaline ascospores (Ariyawansa et al. 2014d).
Species