Emmons & Dodge (1931)
Colonies on potato dextrose agar at 25°C are white to gray to brownish, varying considerably between strains. Colonies are somewhat restricted in growth, and may become reddish with the liberation of ascospores. Perithecia appear as small black dots in the concentric rings.
Hyphae are septate and hyaline initially, darkening with age. The Scopulariopsis trigonospora anamorph is dematiaceous, with conidiophores arising from the vegetative hyphae either singly or in groups. Annellophores are long and narrow, broad in the center, and tapering toward the ends. Annelloconidia are brownish, borne in chains, are truncate at the basal end, rounded or papillate at the apex, and measure approximately 2.5-3.5 x 3.5-5.5 µm. The sexual structures, perithecia, are black, globose at the base, 125-250 µm in diameter, with very long necks measuring up to 250 µm. Asci measure 6-9 x 9-12 µm and are oval to subglobose. Ascospores are pale to reddish-brown in mass, concave on all sides (triangular), and measure