Thallus whitish, effuse, or ± membranous and irregular in thickness, matt, in minute clusters 0.1 mm diam., or less, often coalescing into pale, scurfy patches 1-3(-5) mm diam., on upper surface of leaf at margins and near midrib, without a delimiting prothallus. Apothecia adnate, somewhat inconspicuous, slightly elevated above thallus, 0.01-0.08 mm diam., elongate, curved, triangular or irregularly rounded, partly or wholly covered with grey-white thalline tissue, disc brown, apparent as a thin, elongate, curved or triangular slit, or more widely exposed. Exciple dark brown, 12-18 µm thick. Hymenium 35-50 µm tall, colourless. Asci clavate 30-50 × 8-16 µm. Ascospores (1-)2-8 (commonly 6 in New Zealand material)-septate, colourless, 4-6(-8) per ascus, 12-23 × 5-10 µm.