The diminutive species Micarea capitata is described from north-western Sweden. It has been found at two localities in boreal forests where it grew on the bryophyte Hylocomium splendens. Micarea capitata is distinguished by small (0.10-0.35 mm diam.) black apothecia, (0-) 1-septate ascospores and a mottled, darkly pigmented hypothecium.