Abstract:The epidermal cuticle characteristics of Sublepidodendron cf. xinjiangense Sun in Wutong formation of late Devonian from Yixing city of Jiangsu province were studied using the technique of fluorescence analysis. The stem cuticle extended over the leaf cushions and its interval zones, when the cuticle thickness was more than at the leaf cushions. The shape of the epidermal cells in the interval zones differed from that in the leaf cushions; in which the epidermal cells of the central parts of the interval zones appeared in the elongated polygons, with coincided cell stretch direction as the stem growth, and with slightly curve cell walls. The shape of cells in the interval zones near the leaf cushions was similar to that in the former but only one half in size. with straight cell walls. Here the cells extended gradually with a deflection toward the margin of the leaf cushions. The cushion cellsware equilaterl polygons with visible cell interspaces. No stoma was discovered in the epidermis of this species.