Thallus generally leprose (rarely endogenous), either byssaceous or crustose-leprose, thin to thick, non-corticate, bright yellow to vivid yellowish-green, unstratified and coloured throughout, being composed entirely of a mass of pulverulent, convex to spherical granules or anastomosing filaments, thallus margin absent, without lobes, prothallus not apparent. Photobiont green, Protococcaceae, cells spherical to 22 µm diam., both singly and in groups. Apothecia rare, to 2.0 mm diam., scattered or clustered, innate or superficial, orbicular, concave to spherical with a thin, non-corticate margin or immarginate, disc smooth, green to yellow-green to light orange or brownish, often yellow-pruinose. Paraphyses 1-1.5 mm thick, colourless, septate, richly anastomosing above asci. Ascospores 8 per ascus, narrowly obovoid to narrowly ellipsoid, straight or curved, colourless, 3-septate (rarely only 1-2-septate) the second cell often the largest of the four, 9-14 × 2.5-5 µm. Pycnidia absent.