CONIDIAL STATE: Acremonium sp.

Mycelium ferrugineous hyphae surrounding the base of each perithecium, not apparent elsewhere. Perithecia gregarious, orange and forming extensive orange areas on the substrate, hirsute, urniform, 250-300 µm high x (310-) 375-440 (-530) µm wide, becoming collabent when dry, not changing colour in 3% potassium hydroxide. Perithecial wall 60-75 (-100) µm wide. Surface view: cells circular, (10-) 15-20 (-30) µm in greatest dimension, thin-walled. Longitudinal section: outer region 45-80 µm wide. cells circular, 20-30 µm in greatest dimension, thin-walled. Inner region 15 µm wide, cells flattened and compacted. Perithecial hairs triangular, (60-) 90-120 (-150) µm long x 60-70 µm basally, orange; arising from the surface of the perithecial wall and composed of a fascicle of unbranched, septate, smooth, thin-walled, 3 µm-wide hyphae. Perithecial papilla short, acute, formed of narrow hyphal elements arising from the inner region of the perithecial wall; ostiolar canal periphysate. A.sci clavate, (50-) 60-70 (-80) x (6-) 12-14 (-20) µm, 8-spored; apices rounded, simple; bases pointed; ascospores biseriate, forming throughout the length. Ascospores ellipsoidal to fusiform, 17-23 (-29) x 5-7 µm, equally 2-celled, striate or smooth, not constricted or slightly constricted at the septum, hyaline.

CHARACTERISTICS IN CULTURECMD: Ascospores germinating in low percentage overnight; a single germ tube arising from each end of each ascospore. Colonies 3-5 cm diam., opaque or rarely translucent, grey to white, aerial mycelium sparse to abundant and loose with faint concentric rings of erect, outwardly directed hyphae, margin undulate, non-aromatic, medium nonpigmented. ME: 1 cm or less diam., opaque, white, aerial mycelium lacking or sparse, margin undulate, nonaromatic, medium non-pigmented. OA: 7 cm diam., opaque, white to tan, aerial mycelium dense, with concentric rings of erect, outwardly directed hyphae and hyphal rope-like strands, margin undulate, non-aromatic, medium nonpigmented. WAS: 4-8 cm diam., translucent, nearly invisible, grey, aerial mycelium sparse or lacking, margin entire to slightly undulate, non-aromatic, medium non-pigmented. Perithecia forming within 6 weeks in cultures from single ascospores. Phialophores forming only on CMD, OA, and WAS after 2-4 weeks from aerial mycelium, unbranched, monophialidic, aseptate, straight to sinuous, smooth, 18-43 µm long, 2-3 µm wide basally, 1-1.5 cm wide at the unflared tip. Conidial production sparse. Phialoconidia oblong-elliptical, (5.5-) 6-9 (-1,3) x 2-2.5 (-3) µm, unicellular, hyaline, with or without a slightly protuberant, flattened, basal abscission scar. Arising in basipetal succession, held in a single, terminal, hyaline drop of liquid.