CONIDIAL STATE: Acremonium sp.

Mycelium not visible, or white and growing around the perithecial bases; hyphae unbranched, septate, thin-walled, c. 4 µm wide, arising from the cells of the base of the perithecia. Perithecia solitary to gregarious, yellow to orange, globose to urniform, 370-420 µm high x (250-) 370-430 (-550) µm wide, becoming collabent when dry, not changing colour in 3% potassium hydroxide. Perithecial wall 30-50 (-70) µm thick. Surface view: cells circular, 10-15 µm in greatest dimension, thin-walled. Longitudinal section: outer region 15-30 (-50) µm wide, cells circular, 10-15 µm in greatest dimension, thin-walled. Inner region 15 µm wide, cells flattened and compacted, thin-walled. Perithecial hairs lacking, or short, triangular, orange; composed of a fascicle of septate, unbranched, thin-walled hyphae. Perithecial papilla lacking or short and acute; formed of narrow hyphal elements arising from the inner region of the perithecial wall; ostiolar canal periphysate. Asci clavate, (40-) 60-75 (-100) x (5-) 8-10 (-14) µm, 8-spored; apices flat, simple; bases pointed; ascospores biseriate above, uniseriate below, forming throughout the length. Ascospores ellipsoidal, (9-) 11-14 (-17) x (3-) 5-6 µm, equally 2-celled, striate or smooth, not constricted or slightly constricted at the septum, hyaline.

CHARACTERISTICS IN CULTURECMD : 1-5 cm diam., opaque, white to pale pink or pale brown, sparse aerial mycelium, margin slightly undulate, non-aromatic, medium non pigmented, perithecia forming within 1 month, homothallic. ME: 0.5-2 cm diam., opaque, white to pale pink, aerial mycelium sparse, margin undulate, nonaromatic, medium non-pigmented. OA: 1.5-7 cm diam., opaque, white to tan, flat, with hyphal rope-like strands, margin slightly undulate, non-aromatic, medium non-pigmented, perithecia forming within 1 month, homothallic. WAS: 1 cm in diam., translucent, nearly invisible, aerial mycelium lacking, margin slightly undulate, non-aromatic, medium non-pigmented. Phialophores forming only on CMD and OA from surface of agar and aerial mycelium, unbranched, monophialidic, aseptate or rarely sep tate, straight, smooth, (23-) 30-40 (-65) µm long, 2-3 µm wide basally, 1-2 µm wide at the unflared tip. Phialoconidia ellipsoidal becoming elongated, (3.5-) 7-9 (-13) x 3-4 µm, unicellular, hyaline, without a basal abscission scar; arising in basipetal succession, held in a hyaline drop of liquid at the tip of each phialide.