Ascomata apothecia, one to several in each host areole, black, 0.8-1.0 mm diam., disc flat; exciple 20-30 um tall, black; epithecium 10-12 um tall, red-brown, K+ becoming purple; hypothecium dark brown; hymenium, 70-80 um tall, hyaline. Paraphyses branched and anastomosed, c. 2 um thick, the apices slightly swollen to 3-4 um. Asci clavate, 50-55 X 12-17 um, 8-spored. Ascospores broadly ellipsoid, brown, 3-septate, mostly with oblique septa, 16.5-20 X 8.5-10 um.
Distribtuion: Greenland, known only from the type collection.
Host:Lecidea atromarginata Magnusson, causing swelling of the thallus and suppression of the formation of apothecia.
Note: The anatomical characters of the apothecia are very similar to those of Rhizocarpon furax Poelt & V. Wirth, but that species is clearly lichenized with a yellow thallus.