This species is a
crustose lichen with a light green
thallus up to across and 50–80
μm thick. The surface is smooth to uneven and has abundant soredia; the soralia are about 0.1–0.2 mm wide and may merge into irregular or net-like patches. The is the green
alga Trentepohlia, and the and
medulla contain clusters of
calcium oxalate crystals; the medulla is white but grades indistinctly into surrounding tissues. The fruiting bodies (
apothecia) are rounded to irregular, partly protruding from the thallus (), and 0.4–0.8 mm in diameter, with the visible through a narrow pore-like opening about 0.05–0.1 mm wide; a central column (columella) is absent. The outer wall of the fruiting body () is built of interwoven, elongated cells () and is dark brown to blackened () in the outermost layers.
Ascospores are colorless, 6–8-celled (5–7-septate), and measure 20–25 × 6–8 μm; they stain violet-blue with iodine (I+ violet-blue).
Thin-layer chromatography detected
psoromic,
subpsoromic, and 2'-
O-demethylpsoromic acids. ==Habitat and distribution==