Conidiophores arising singly, hyaline or with the upper part brown, smooth, few or no septa, up to 3 mm long, 15–20 µm thick, swollen at the apex into a vesicle; vesicle spherical, 40–75 µm diam., covered in short terminal branches (metulae), each 30–30 × 5–6 µm, branches narrowest at base, widest near apex. Conidiogenous cells phialidic, in groups of 2–3 at the apex of each terminal branch, flask-shaped, 7–10 µm long, 3–4 µm wide in middle, 1–1.5 µm wide at apex. Conidia in dry chains, globose, (3–)4–5 µm diam., brown, verruculose or echinulate; conidial heads dark brown to black, initially globose but often splitting into well-defined conidial columns.