Thallus effuse, consisting of contiguous, grey to ochracous, flat to convex areoles; medulla and upper algal-free layer I+ violet. Photobiont chlorococcoid; cells 9–12 µm diam., arranged in a discontinuous layer composed of vertically aligned columns c. 5 cells wide.
Apothecia black, 0.4–0.8 mm diam., immersed in the thallus; disc convex when young becoming gyrose when mature, proper margin, striate, in section cupular, carbonaceous, c. 50 µm wide laterally, 20 µm at base. Hymenium 170–180 µm tall, upper 15–20 µm with brown pigment; paraphyses richly branched and anastomosing, 1–1.5 µm wide, apically to 2.0–2.5 µm; epihymenium brownish. Asci clavate-cylindrical, c. 60 × 15 µm, Porpidia-type; ascospores simple, hyaline, subglobose to ellipsoid, with a thin halo, 12–15 × 6–8 µm. Hypothecium hyaline.
Conidiomata: pycnidia, slit-like, 10–20 µm long, simple or branched, black with a white pseudomargin; conidia bacilliform, 6–7 µm long.
Chemistry: no substances by TLC.
Distribution and Ecology: Known from a single collection from damp siliceous rocks in Tasmania. Associated species include Collema durietzii Degel., Xanthoparmelia mougeotina (Nyl.) D.J. Galloway, and unidentified species of Aspicilia and Placopsis.
Remarks: This species appears to closely resemble P. urbanskyana (Zahlbr.) Hertel, from which it differs in its much smaller ascospores and cool-temperate, as opposed to subantarctic, locality.