Perithecia gregarious on an erumptent, prosenchymatous stroma, up to 1 cm diameter, perithecia globose or oval, 0.2-0.3 mm diameter, tuberculate, scarlet or coral coloured, farinaceous with crystals, perithecial wall pseudoparenchymatous, 50 µ thick, cells up to 12 µ diam. walls pigmented and thickened. Asci cylindrical, rarely clavate, truncated, 90-120 x 10-12 µ, 6-8 spored, uniseriate, sometimes biseriate at apex; pseudoparaphyses evanescent. Spores one septate, elliptical or pyriform, ends rounded, 16-24 x 6-10 µ, hyaline or lightly pigmented, striate.

Perithecia gregaria in stromate erumpenti prosenchymato ad 1 cm diam.; globosa vel ovalia 0.2-0.3 mm diam., tuberculata, rubra vel corallina, farinacea, pariete pseudoparenchymato 50 µ crasso, cellulis ad 12 µ diam. parietibus tinctis et densatis. Asci cylindrici raro clavati, truncati 90-120 x 10-12 µ, 6-8 sporis, uniseratis, pseudoparaphysibus evanescentibus. Sporae uniseptatae, ellipticae vel pyriformes, apicibus rotundis 16-24 x 6-10 µ hyalinae vel subtiliter tinctis, striatae.

Collections misdetermined as N. balsanae Speg. by Dingley (1951b) are included under this species.

Type collection: on Hoheria populnea A.Cunn., Auckland, Titirangi, March 1947, J.M.D. (7465).