Type: Caulicolous Fungi; Description: Ascomata embedded in irregular layers in the cortex at the base of a stroma, perithecial, aggregated in groups of up to 10, oval to globose with a flattened base, black, 0.4–0.6 mm in diameter, with necks up to 400 –m long, erumpent through the stroma. Stroma dark brown to black, conical, up to 3 mm in diameter at the base, erumpent through the bark and exposing a dark brown to black disc on which the protruding ostioles are visible as black papillae; on dead and dying branches. Asci cylindrical, 70–125 × 5–9 5m. Ascospores cylindrical to fusoid, slightly curved, 0-septate, 30–75 × 3–8 3m, smooth, hyaline. Conidia developing in locules on the sides of the stroma, cylindrical, strongly curved, 30–70 × 3–6 3m, smooth, hyaline.

Distribution: Auckland, Taranaki, Wellington.; 1st Record: Ridley (2001b: as Winterella betulae).

Significance: Infrequently found on trees showing dieback. It is regarded as a saprobe (Reid & Booth 1987).; Host(s): Betula pendula.