Gnomonia Ces. & De Not.
Saprobic on overwintered, fallen or attached leaves of shrubs, usually epiphyllous or on petioles, rarely hypophyllous. Sexual morph: Ascomata perithecial, solitary, without stroma. or sometime very poorly developed stromatic tissues, black, initially immersed, later become erumpent, rarely partly erumpent, sometimes wide opening with pinkish white powdery collar around the neck, globose to subglobose when moist, bowl-shaped when dry, with 1–3 necks Necks central to marginal, never truly lateral, slightly curved, longer, sometimes almost absent. Asci 8-spored, unitunicate, oval to fusiform, short stalked, with J- apical ring. Ascospores overlapping uniseriate or irregularly multi-seriate, one septate, fusiform to acerose, ends narrowly rounded, appendages ovoid, subulate or acicular with diffuse ends or rarely absent (Description based on Maharachchikumbura et al. 2016). Asexual morph: see Gnomonia papuana Sivanesan and Shaw (1977).
Type species: Gnomonia vulgaris Ces. & De Not., Comm. Soc. crittog. Ital. 1(fasc. 4): 232 (1863)
Notes: The genus Gnomonia was introduced by Cesati and De Notaris (1863) and typified by Gnomonia gnomon. Gnomonia comprises 273 species and only one species has been reported from freshwater habitats (Sivanesan and Shaw 1977; Fallah and Shearer 2001; Senanayake et al. 2018).
Freshwater species: Gnomonia papuana Sivan. & D.E. Shaw
Cesati V, De Notaris G (1863) Schema di classificazione degle sferiacei italici aschigeri piu’ o meno appartenenti al genere Sphaeria nell’ antico significato attribuitoglide Persono. Commentario della Soc Crittogamologica Ital 1:177–420
Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.
Maharachchikumbura SSN, Hyde KD, Jones EBG, McKenzie EHC et al. 2016 - Families of Sordariomycetes. Fungal Diversity 79:1–317.
Sivanesan A, Shaw DE. 1977 - Gnomonia papuana sp.nov with a sesquicilium conidial state. Trans Br Mycol Soc 68:85–90