Pollen Morphology and Species-level Distinction of the Genus Fagus from the Hachiya Formation (Lower Miocene), Mizunami Group, Japan

概要

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Pollen morphology of the genus Fagus from the Hachiya Formation (Lower Miocene) is described using light and scanning electron microscopy (SEM), and that of modern Fagus in Japan is also examined to set up criteria for species-level distinction. Exine sculpture of modern two species, Fagus crenata Blume and F. japonica Maximowicz, is uniform within each species and resembles each other. Small outliers of the grain size distribution and smaller grains exhibit slightly different exine sculpture from that of normal grains. Each of the two species has specific ranges of grain size and polar area index. More than 100 grains of fossil Fagus pollen are examined and divided into four types, A, B, C and D, on the basis of exine sculpture observed in SEM. Type A includes two species of the genus. Types B, C and D are morphological variation of type A species pollen, or are other species. Two or more Fagus species occurred in Japan in Early Miocene age.
名古屋大学の論文
1992-12-00