Thallus effuse, thin, minutely granulose-verrucose, granules to 0.2 mm, occasionally larger and papilliform, pale brown, shining, esorediate. Apothecia minute, 0.2-0.3 mm, adnate; margin concolorous with disk; exciple brown or reddish brown; disk shining black, epruinose, soon slightly convex; hypothecium brown or reddish brown; epihymenium blue, bluish brown or pale blue; hymenium 88-100 μm; upper part blue or blue-brown; paraphyses easily separated, tips not thickened; asci subcylindrical; spores uniseriate, broadly ellipsoid to subglobose, thick-walled, 9-15 x 8-11 μm.

Reactions: K+ brown, C—, P—, I—.

This species grows over moss. It is rare, and the range is very uncertain. It is known from Scandinavia and France and has recently been reported from the Okpilak Valley in northern Alaska by Coppins (1984).

In its thick-walled spores this species resembles L. tornoensis, but it has cylindrical asci and uniseriate spores which are nearly globose and smaller than those in L. tornoensis.