Thompson, J., 1984. American Arctic Lichens: The Macrolichens.
Primary thallus disappearing; pseudopodetia strongly attached to the ground forming cushions 1-2 cm broad, 5-10 (-11) mm high, the bases 0.3-0.6 mm thick, white with a rosy tinge, the upper parts abundantly branched and the tips becoming capitate sorediate; phyllocladia on upper side of decumbent pseudopodetia, flattened verruciform, glaucous white, confluent, soon disappearing into farinose soredia; cephalodia inconspicuous, imbedded in the tomentum, containing Nostoc. Central medullary layer densely conglutinate, of pachydermatous hyphae 2-3 thick, the lumen 1-1.5 µ, KOH+ yellow, gray or dark yellow-brown in color (with the same KOH reaction); outer hyphae white, forming a thick tomentum 50-90 µ thick of white gelatinous thick-walled hyphae 5-7 µ diameter, on the upper side the algae are in glomerules or more or less continuous; phyllocladia with a cortex 15-25 µ thick, dissolving into soredia, the soredia with a distinct 5 µ thick layer of thick-walled cells. Apothecia and pycnidia not known.