Specimen examined: on living leaves of Corokia cotoneaster Raoul, Pouakani North, Kinleith Forest (TO), 24.vii.1984, R.M.J.MacKenzie, NZFRI-M 3212.

Perithecia hypophyllous, solitary, club-shaped with a conical tip, narrowed below to a short cylindrical stalk with its base immersed in the leaf epidermis; opening by an apical pore; dark brown but getting paler towards the base and towards the apex which is almost hyaline; 0.6-1.2 mm tall, 0.5 mm wide at the widest part, stalk 0.15 mm wide. Outer layer of perithecial wall formed of brown, polygonal cells 3-4 µm wide. Asci fasciculate, narrowly cylindrical, apex rounded, 170-250 x 3-1 µm. Ascospores filiform, hyaline, 0-septate, 170-200 µm x 0.5 µm.

New Zealand distribution: Taupo (1).

Comparison of this Acrospermum sp. with other species of Acrospermum with clavate ascocarps shows it to be close to A. viticola Ikata (Table 4 [not provided here]). Unfortunately, the conidial stage, which would have helped in the identification, could not be produced in culture.