| Project/Area Number |
63540545
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
植物形態・分類学
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| Research Institution | Chiba University |
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Principal Investigator |
NISHIDA Makoto Chiba University, Faculty of Science, Professor, 理学部, 教授 (40009428)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIDA Harufumi International Budo University, Faculty of Physical Education, Lecturer, 体育学部, 講師 (30164560)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1989: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | plant fossil / petrified plant / Cretaceous / angiospermy / fructification / bennettitaleans / cycads / conifers / 花化石 / 球果 |
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| Research Abstract |
The following results concerning the phylogeny of Angiosperms, Particularly relating extinct gymnosperms of preangiosperm stages have been obtained.
1. A gymnospermous female fructification, which is supposed to be a new order, from the Cretaceous of Hokkaido will soon be published elsewhere in a scientific journal. This fructification develops a thick envelop around a large unitegmic seed, and is morphologically comparable, but analogous to the angiosperm fruit.
2. A bisporangiate reproductive organ from the Cretaceous of Hokkaido was assigned to a flower of a bennettitalean plant, Cycadeoidella Ogura (1930). The bennetitalean flower has never been described from East Asia before this finding. This well-preserved organ provides important and unequivocal evidence for better understanding the reproductive biology of the bennettitaleans.
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