Thallus thin, continuous, whitish to pale green, distinctly granular or farinose, partly immersed in bark, without a prothallus. Photobiont chlorococcoid, with spherical green cells 8–14 µm diam.
Anamorph: conidiomata pycnidia, always present, sessile, conspicuous but quite small (ca 0.1 mm diam), globose, usually with a wide open ostiole, pale orange to brownish, the cavity unilocular and lined with conidiophores. Conidiophores hyaline, elongate. Conidiogenous cells elongate or sometimes ampulliform. Conidia of two types, not produced in the same pycnidia: (a) bacilliform, 3.5–5.5 x 0.8–1.5 µm; (b) ovoid, with a slightly pointed end, 2.5–3.0 x ca 2 µm.
Teleomorph: ascomata apothecia, 0.15–0.4 mm diam., usually present, scattered over the thallus or in groups, sometimes contiguous but not agglomerated, round, with a slightly constricted base. Disc dark orange to pale reddish brown, flat and becoming slightly convex in old apothecia, the margin distinct in young and mature apothecia but hardly present in old ones, slightly paler and sometimes slightly sinuose. Excipulum hyaline, 40–45 µm thick, with radiately arranged, thick-walled hyphae, with small crystals in the protoplasm that disappear in K. Hypothecium hyaline. Hymenium hyaline, 40–60 µm high, sometimes with vertical rows of tiny hyaline crystals, especially in the upper parts. Interascal tissue of paraphyses, rather sparse, usually shorter than the asci, unbranched, not swollen at their tips, ca. 1 µm diam. Asci 25–35 x 7–10 µm, clavate or sometimes slightly turbinate, with an amyloid outer layer and tholus, and usually an IKI+ dark blue tube like structure, 8-spored. Ascospores 8–12 x 2.0–3.5 µm, narrowly ellipsoidal with rounded ends, straight or slightly curved, sometimes distorted, very thin-walled, 1- to 2- (to 3-) septate.