Gymnoderma insulare Gymnoderma insulare Yoshim. Gymnoderma insulare resembles G. coccophorum but differs in having medium-sized squamules, 5-8 mm long, 2-4 mm wide, 0.2-0.3 mm thick and the thickness of the cortex is more than twice that of the medulla. This species has been known to occur in Japan and Taiwan. In Japan, it is found on old Cryptomeria japonica in Mt. Koya, Mt. Tsurugi of Shikoku and Mt. Higo, Fukuoka Pref. But recent report confirmed only of Okuno-in, Mt. Koya. distribution map of Gymnoderma insulare