Trees to 60 m tall and 1.8 m dbh. Mature trees follow the usual Agathis model of a long clear bole with a broad emergent crown of large rigid first-order branches. The authorities differ in opinion about the bark, calling it gray, red-gray, light brown, or black, finely dimpled to thinly scaly or with many resin blisters, or rough, exfoliating thus with few epiphytes. Leaves sub-opposite, thick, coriaceous, light to dark green, highly variable even on a single tree. On young trees lanceolate, acuminate, 3x7 cm to 3.5x13 cm.