Diversity and significance of late cretaceous permineralized plant remains from Hokkaido,Japan |
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Authors: | Harufumi Nishida |
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Institution: | (1) International Budo University, 841 Shinkan, 299-52 Katsuura |
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Abstract: | Middle to Late Cretaceous permineralized plants hitherto described from Hokkaido, Japan are summarized. The fossil flora comprises
fungi, ferns, gymnosperms and angiosperms. Many modern fern families have been recognized including Anemiaceae, Cyatheaceae,
Dennstaedtiaceae, Gleicheniaceae Loxsomaceae, Lygodiaceae and Matoniaceae. Gymnosperms are most abundant in the flora. Some
recently-found materials are tentatively introduced with brief comments emphasizing their morphological and taxonomical significance.
A bisporangiate flower ofCycadeoidella japonica Ogura shows fine internal anatomy and provides evidence that the cycadeoidalean ovule was a cupulate, unitegmic structure.
Vascular tracheids in the synangial wall support the evolution of cycadeoidalean synangia from Paleozoic seed-fern synangia.
A new gymnosperm female fructification has a thick envelope comparable to an angiosperm carpel around a large seed. The angiosperms
contain various morphologies that require further extensive study. |
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Keywords: | Cretaceous Fossil Hokkaido Permineralized Plants |
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