Alloleptosphaeria Ariyawansa, Wanasinghe & K.D. Hyde, gen. nov.
Index Fungorum number: IF 551460, Facesoffungi number: FoF 01152
Etymology: In reference to themorphological resemblance toLeptosphaeria
Type species: Alloleptosphaeria italica Wanasinghe, Camporesi, Ariyawansa & K.D. Hyde
Saprobic on dead herbaceous branches in terrestrial habitats. Sexual morph: Ascomata solitary, scattered, immersed to semi-erumpent, globose or subglobose, dark brown to black, coriaceous, fused to the host tissue, ostiolate. Ostiole papillate, black, smooth, ostiolar canal filled with sparse periphyses, upper covering of ostiole comprising short, light brown setae-like structures.Peridium thin-walled, composed of a few layers of thin-walled, brown to dark brown, or reddish brown, pseudoparanchymatous cells, forming a textura angularis. Hamathecium comprising 1.5–2.5µm wide, filamentous, branched septate, cellular pseudoparaphyses.Asci 8-spored, bitunicate, fissitunicate, cylindric-clavate to clavate, pedicellate, rounded and thick-walled at the apex, with an ocular chamber.Ascosporesoverlapping 1–2-seriate, initially hyaline, becoming yellowishbrown at maturity, fusiform to clavate, 3-septate, constricted at the septa, cell above central septum widest, narrowly rounded at both ends, smooth-walled, lacking a mucilaginous sheath. Asexual morph: undetermined.
Notes:Alloleptosphaeria is introduced in the family Leptosphaeriaceaeto accommodate A.italica, based on both morphology and phylogeny. Alloleptosphaeria shares similarities with Leptosphaeria in having conical ascomata, a well-developed papilla, cellular pseudoparaphyses, and cylindrical asci with an ocular chamber, bearing narrowly fusoid, reddish to yellowish brown, 3-septate ascospores. Alloleptosphaeria however, differs from Leptosphaeriain having immersed ascomata, with a thin-walled peridium, composed of a few layers of thin-walled, brown to dark brown or reddish brown, pseudoparanchymatous cells, forming a textura angularis and fusing outwardly with the host cells, while Leptosphaeria has superficial ascomata with thick-walled, scleroplectenchymatous cells, arranged in a textura angularis-globulosa,with an outer black amorphous layer not fusing with the host tissues. This is also supported phylogenetically as Alloleptosphaeriaitalica forms a distant clade, outside the Leptosphaeriasensu stricto clade with high bootstrap support.