68., On Fossil Plants from the Environs of Sendai (I).,

Abstract

In the present article is treated a Neogene flora of the Nenosiraisi plant bed., The plant bed is one of the prolific plant bearing deposits hitherto found in the environs of Sendai, its type locality being Nenosiraisi, about 12km., NW., of the City; the plant bed seems to occupy a considerable area around the type l-ocality., The material were collected by Mr., H., Okutsu and the writer during the several years past from the type horizon and from some others thought to be almost contemporaneous with it., The plant species discriminated of the material are listed., The flora consists of 52 species in 37 genera, and has 7 genera (about 19% of the whole) and 13 species (about 25% of the whole) exotic to the present flora of the islands of Japan proper., Some of them, however, are now living in T-aiwan., Furthermore, 10 genera (about 27% of the whole) and 16 species (30% of t-he whole) are no more living in northern Honsyu., The plant bed is Upper Miocene in age, judged on the mammalian and molluscan remains found in the underlying S-iogama and overlying Tatunokuti group.,