Thallus effuse, thin, pale creamy-brown, usually covering relatively large areas (to 15–20 cm diam.). Photobiont chlorococcoid, cells (9–)12–15(–18) µm diam.
Apothecia scattered, dark brown, arthonioid, sessile, (0.2–)0.3–0.4(–0.6) mm diam., ±round, becoming irregular when old, flat to slightly convex, without visible exciple. Hymenium hyaline, I+ blue, 125–150 µm tall; epihymenium brown (K+ olivaceous), granular, 12–20 µm wide. Paraphysoids very fine, 1.0–1.5µm, branched and anastomosing, strongly conglutinate in K. Asci clavate, 70–80 × 35–40 µm. Ascospores hyaline, 8/ascus, 27–35 × 12–13.5 µm, muriform, 5–7 longitudinal septa, 1-2 transverse septa, outer wall I+ blue. Hypothecium pale brown, 70–80 um high, clearly separated from the thin dark-brown excipulum that extends below the hypothecium. Excipulum cupular, poorly developed, thin, 15–20um wide hyaline with a dark brown (K+ olivaceous) outer zone c. 7.5um wide.
Conidiomata pycnidia, usually present, brown, immersed, 0.1mm wide, walls brown (K+ olivaceous) above, hyaline below, Roccella-type. Conidia simple, bacilliform c. 7–8.5 × 0.8um, arising from, simple, barely differentiated conidiogenous cells, Type I of Vobis (1980).
Chemistry: Thallus and apothecia C–, K–, KC–, Pd–.