[in Japanese with English summary: ] The succession and development of the Gyrophora esculenta community have been observed on Mt. Kuishi in Shikoku. In 1960, three quadrats denuded of G. esculenta were set up on siliceous rocks at an altitude of 970 m above sea-level (Fig. 1). Because it was difficult to remove all individuals of very small size from rock faces, the succession may be considered to have started from the beginning of the foliose lichen stage. During seven years, as shown in Fig. 2, the residual G. esculenta has grown slowly, the size varying considerably with the environment, and individuals of slow growth have been found on sunny and steep rock faces. No other lichens and mosses newly appearing from the quadrats have yet been observed. From these facts it is inferred that the completion of the G. esculenta community requires long periods of time and that the well-developed community on exposed rocks is hardly ever replaced by other communities.