Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus thin, whitish or yellowish white, smooth, continuous to warty, shiny, epruinose, lacking isidia or soredia. Fertile verrucae with bases constricted, almost spherical, to 0.8 mm broad; ostiole slightly sunken to papillate, dark; margin also often dark. Apothecia 1 (rarely 2 or 3) per verruca; hypothecium hyaline; epithecium dark, K+ violet; hymenium hyaline to pink; asci cylindrical; spores 8 (rarely 6) uniseriate, longitudinal or oblique in orientation, double-walled, outer wall 1-4 ¡xm, inner 1-6 μm, tips usually convex inward, ellipsoid to fusiform, 28-98 x 11-53 μm.