Structure and affinities of the petrified plants from the cretaceous of Northern Japan and Saghalien. XII.Obirastrobus gen. nov., petrified pinaceous cones from the Upper Cretaceous of Hokkaido |
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| Authors: | Takeshi Ohsawa Makoto Nishida Harufumi Nishida |
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| Institution: | (1) Laboratory of Phylogenetic Botany, Faculty of Science, Chiba University, 263 Chiba, Japan;(2) Research Institute of Evolutionary Biology, 156 Tokyo, Japan;(3) International Budo University, 299-52 Chiba, Japan |
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| Abstract: | Two new species of pinaceous cones belonging toObirastrobus gen. nov. are described from the Upper Cretaceous of Hokkaido. Bract-scale complexes are arranged helically and each consists
of a small bract and a large scale. The bract and scale are separated. The scale tapers distally and its apex does not become
papery. The anatomy of the bracts, scales, and seeds shows a combination of features unique in the Pinaceae and resembling
those of the extant genusKeteleeria and the extinct genusPseudoaraucaria.
Consecutive number from the previous paper (Ohsawaet al., 1992). Supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture Nos. 63540545
and 02640533 to Makoto Nishida. |
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| Keywords: | Cretaceous Hokkaido Obirastrobus Petrified cone Pinaceae |
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