Anamorph: conidiomata pycnidia, 500–1500 μm diam, flask-shaped to irregularly subglobose, amphigenous, scattered or aggregated, subepidermal, splitting the epidermis, multilocular, with individual locules to 170 μm diam., with individual ostioles to 25 μm diam. Conidiophores simple or branched, septate, often absent. Conidiogenous cells lining the inner layer of the conidioma, (5–) 7–15 × 2–3 (–4) μm, hyaline, smooth-walled, covered in a gel layer, proliferating percurrently, with visible periclinal thickening. Conidia (10–) 13–15 (–18) × (2.5–) 3 (–4) μm, ± cylindrical, aseptate, hyaline, the base bluntly rounded with a central, flattened scar, the apex with a funnel-shaped gelatinous appendage.
Teleomorph: ascomata immersed apothecia, amphigenous, ± circular, 300–2000 μm diam., aggregated or solitary, initially immersed, subepidermal, becoming erumpent, opening by 3–5 teeth composed of host epidermal tissue lined with brown globose cells, to expose the hymenium, with an inner layer of periphysoids covered in mucilage. Interascal tissue of unbranched paraphyses, septate, hyaline, anastomosing, surrounded by mucilage. Asci 70–110 × 7–10 μm, clavate, the apex obtuse, thin-walled, not fissitunicate, with an I+ apical ring, 8-spored. Ascospores arranged biseriately, 9.5–12.5 × 3–3.5 μm, ellipsoidal to fusiform-ellipsoidal, aseptate, hyaline, smooth, guttulate, without an epispore or gelatinous sheath.
Not formally assessed, but this is a common species and unlikely to be in need of protection.
On needles of conifers, especially those of Pinus sylvestris; occasional records on leaves of non-coniferous hosts.
Throughout Great Britain and Ireland.