Retrospectively analyzed data from 60 publications 1926-2012 about the presence or absence of arbuscular mycorrhizas in species of the genus Carex L. (Cyperaceae). There are 173 species sedges, in relation to which there is information about mycorrhizal status. In 98 species (57%) mycorrhiza is not found; the 23 species (13%) mycorrhiza is found always; 52 species (30%) may form or do not form mycorrhiza. The share of Carex species, in respect of which shows the ability to form mycorrhiza, increases with the increase of the number of research.