Thallus fruticose, in felt-like clumps on bark or twigs to 3 cm diam., flaccid and ± spongy when wet, brittle when dry. Branches terete, rather fragile, very fine at apices, stouter (to 0.2 mm wide) below, branching ± dichotomous, but densely tangled and complex in older parts. Surface of branches smooth or slightly wrinkled, blue-green or blackish at apices, bluish-brown or tan below. Photobiont . Apothecia fre-quent, lateral, to 1.5 mm diam., disc reddish-brown, subconvex, immarginate. Ascospores polymorphic, 9-13 × 1.5-7 µm. Chemistry: Nil.