Marielliottia Shoemaker, Can. J. Bot. 76(9): 1559 (1999) [1998].

Pathogenic on cereals, grasses and seeds or saprobic on wood and leaves. Sexual morph: unknown. Asexual morph: Conidiophores solitary to clustered, erect, septate, straight, brown, closely geniculate from sympodial growth or distantly nodose, apex truncate or inflated, forming conidia through a terminal pore, with flat, non-protruding scars, smooth or sometimes slightly roughened. Conidiogenous cells tretic, integrated, terminal, sympodially proliferating, cylindrical or swollen, cicatrized or not cicatrized. One species additionally produces massive, subulate macroconidiophores radiating from a pseudoparenchymatic base. Conidia porogenous, first septum formed near base, transversely 3-septate, exceptionally 2-septate when immature in one species and sometimes up to 5-septate in one species, brown, straight, ovoid or obovoid; scar pore-like, basal, dark brown, not protruding, set off by a hyaline zone, atrium type (Alcorn 1983) or flat in a slightly papillate base. Germ tubes usually two from the basal cell, rarely one from the apex, but never from the central cells (Shoemaker 1998).

 Type species: Marielliottia biseptata (Sacc. & Roum.) Shoemaker, Can. J. Bot. 76(9): 1560 (1999) [1998].