[in German with English abstract: ] In 2003 and 2004, the cryptogam vegetation of young and old calcareous grasslands of the nature reserve „Garchinger Heide“ was studied. Pleurocarpous mosses of the Abietinellion Giac. ex Neumann 1971, which are characteristic for calcareous grasslands, occur in the ancient grassland. The cryptogam layer of ex-arable fields within the nature reserve mainly consists of Thiddium abietinum and Rhytidiadelphus triquetrus, often growing in monospecific stands. The „Rollfeld“ (topsoil removal 1945) is characterized by a high species density of acrocarpous mosses and lichens. Biyophyte mats of Hypnum cupressiforme var. lacunosum and acrocarpous mosses of the Tortelletum inclinatae Stod. 1937 form a distinctive pattem. On bare soil epigaeic lichens of the Toninio-Psoretum decipientis were able to establish in most parts of the „Rollfeld“. Results of a grid mapping showed that they were not able to colonize the whole available area. During succession species-poor Cladonia stands slowly replace the epigaeic lichens and are outcompeted later by vascular plant species.