Late Devonian plant Leptophloeum rhombi-cum (Dawson, 1862) is newly discovered from the “Suberidani lenticular body” of the Kurosegawa Belt in Tokushima Prefecture, Shikoku, Southwest Japan. The twelve specimens are well-preserved in fine-grained sandstone, and the morphologic information may be useful for paleontological study of Leptophloeum. The presence of the Upper Devonian strata has been confirmed now by this fossil evidence in the Tokushima Prefecture. The bed composed of conglomerate, sandstone and shale, about 20 m thick, lies on the Siluro-Devonian Suberidani Group. The relationship between the Upper Devonian and the underlying “Bed G4” of the Suberidani Group seems to be unconformable.