Index Fungorum number: IF512170; 1 species with sequence data.
Saprobic on leaves and petioles. Sexual morph: Ascomata solitary, immersed, scattered, without stroma, on fallen leaves, on petioles and basal parts of major veins of fallen leaves, black, sub oblate when moist, concave when dry, round in top view. Necks central, straight, tapering to their ends, at base surrounded by white powdery collar not soluble in water or 3% KOH. Peridium comprising inner, few layers of hyaline, compressed, cells of textura angularis and outer, brown cells of textura angularis. Hamathecium aparaphysate. Asci 8-spored, unitunicate, fusiform, with J-, distinct apical ring. Ascospores irregularly fasciculate, fusiform, 1-septate, hyaline, with ovoid to subulate appendages. Asexual morph: Undetermined. (Description based on Senanayake et al. 2018)
Type species: Ambarignomonia petiolorum (Schwein.) Sogonov
Notes: The genus Ambarignomonia was introduced by Sogonov et al. (2008) to accommodate Sphaeria petiolorum. Presently, there is only one species accepted in this genus. Sogonov et al. (2008) mentioned the monotypic Ambarignomonia with A. petiolorum and is restricted to one plant host, Liquidambar styraciflua, whereas other genera of the Gnomoniaceae do not show such consistency in host associations.
Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.
Sogonov MV, Castlebury LA, Rossman AY, Mejı ´a LC, White JF. 2008 - Leaf-inhabiting genera of the Gnomoniaceae, Diaporthales. Stud Mycol 62:1–79.