Abstract
Thyrsopterorachis mesozoica, gen. et sp. nov from the upper Cretaceous of Hokkaido, Japan, is described with diagnosis. It closely resembles the extant genusThyrsopteris in its general vascular patterns and histological features.Thyrsopterorachis, however, exhibits a three-parted adaxial vascular system that is arranged in a C-shape instead of the continuous pattern found inThyrsopteris. This is the first report of the fern family Thyrsopteridaceae in the Northern Hemisphere.
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Contributions from the Laboratory of Phylogenetic Botany, Chiba University, No. 71. Contributions from the “Expedición Botanica a los Andes de la Universidad de Chiba”, No. 1., and are supported by a Grant in Aid for Scientific Research from the Ministry of Education, No. 234032.
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Nishida, H., Nishida, M. Thyrsopterorachis, gen. nov., a tree fern rachis from the upper cretaceous of Hokkaido, Japan. Bot Mag Tokyo 92, 187–195 (1979). https://doi.org/10.1007/BF02497930
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DOI: https://doi.org/10.1007/BF02497930