CONIDIAL STATE: Acremonium sp.

Mycelium white, sparse, spreading over the substrate or limited to a fringe of white to ferrugineous hyphae around the base of each perithecium. Perithecia solitary or in scattered groups of 3-4, white at first, becoming orange-brown; hirsute, hairs often forming an apical disc; urniform, 150-200 (-325) µm high x (187-) 220-280 (-374) µm wide, becoming collabent or not collapsing when dry, not changing colour in 3% potassium hydroxide. Perithecial wall 20-30 (-40) µm thick. Surface view: cells prosenchymatous, walls 1-2 µm thick; pigmented. Longitudinal section: cells elliptical to flattened, 4-6 µm long, walls 1-2 µm thick, pigmented, becoming progressively more flattened and thin-walled toward the interior. Perithecial hairs composed of a solitary hypha or a triangular fasicle of tightly bound hyphae.70-200 µm long, 30-40 µm wide basally, orange to brown; hyphae unbranched, septate, 3-4 µm wide, walls c. 1 µm thick, pigmented. Hairs scattered over the upper half of the perithecia) wall or rising in one plane from the perithecia) apex to form a disc 400-500 µm in diam. Perithecial papilla lacking, ostiolar opening formed by narrow hyphal elements arising from the inner region of the perithecia) wall; ostiolar canal periphysate. Asci broadly cylindrical to clavate, (30-) 45-70 (-85) x (6-) 7-9 (-11) µm, 8-spored; apices flat, with an indistinct ring; bases pointed to rounded; ascospores uniseriate or biseriate, forming throughout the length. Ascospores fusiform-ellipsoidal, (9-) 11-15 (-17) x (2.5-) 3-4 (-5) µm, equally 2-celled, 2 drops in each cell, smooth to striate or punctate striate, non-constricted or slightly constricted at the septum, hyaline.

CHARACTERISTICS IN CULTURE CMD: Ascospores germinating overnight, one short germ tube arising from each end of each ascospore. Colonies (2-) 4 cm diam., translucent to opaque, white; aerial mycelium sparse to cottony; hyphal, rope-like strands often forming; margin slightly undulate, non-aromatic, medium non-pigmented. ME: 1-1.5 (-2) cm diam., opaque; white, becoming pink to salmon; aerial mycelium lacking or loose and cottony or as hyphal, rope-like strands; margin undulate, non-aromatic, medium non-pigmented. OA: 2.5-4 cm diam., opaque; white to pale pink at the margin, white to tan to ferrugineous in the centre; aerial mycelium loose and cottony or forming concentric rings of erect, outwardly directed, hyphal, rope-like strands; margin entire, undulate or rarely dissected, non-aromatic, medium non-pigmented. WAS: 3-5 cm diam., transparent; aerial mycelium sparse, undulate, white; margin entire to slightly undulate, non-aromatic, medium non-pigmented. Phialophores arising on CMD, ME, OA, and WAS from the agar surface and from the aerial mycelium; monophialidic, unbranched or rarely verticillately branched, 0-2 (-3) septate, straight or undulate below the tip, smooth, (40-) 45-55 (-78) µm long, (2-) 2.5-3 (-4) µm wide basally, subtending hypha 1.5-2 (-2.5) µm wide. A solitary phialide constituting the terminal (17-) 37-50 (-54) µm of each phialophore, 1-2 µm wide at the unflared tip. Conidial production abundant. Phialoconidia ellipsoidal to nearly cylindrical, rarely elongating, (3-) 5-7 (-11) x (1.5-) 2-3 µm, unicellular, without a basal abscission scar, hyaline. Arising in basipetal succession; held in a solitary, hyaline drop of liquid.