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Betula protojaponica
Betula protojaponica Tanai J. Fac. Sci. Hokkaido Univ., Ser. 4, Geol., 11(2): 290. 20 Mar 1961
- Name
- Betula protojaponica
- Rank
- Species
- Generic Name
- [Genus] Betula
- Authors (Pub.)
- Tanai T.
- Publication
- Neogene floral change in Japan [1961/3]
- Journal
- Journal of the Faculty of Science of the Hokkaido University
- Volume
- 11
- Issue
- 2
- Page number
- 290
- Year
- 1961
- Parent Taxon
- [Genus] Betula
- Fossil Status
- leaves
- Stratigraphy
- Miocene
- Location
- Nukabira, Kami-shihoro-machi, Kato-gun, Hokkaido, Japan
- Paleoregion
- Eurasia (Japanese Archipelago)
Data for Holotypus
- Repository
- National Museum of Nature and Science, Palaeobotany Collection, Tokyo, Japan
- Repository Number
- UHR-15147
- Diagnosis
- Leaves medium in size, deltoid-ovate in general outline, 4.6 to 5.5 cm long and 2.7 to 4.5 cm wide; apex acuminate; base truneate, broadly rounded, or broadly cordate; midrib stout below, becoming thiii distantly, nearly straight; secondary nerves rather stout, 8 to 9 subopposite pairs, diverging from the midrib at angles of about 40 degrees on the midd}e part of leaves, less angles on the upper and moye spreading at the basal part, nearly straight or somewhat curving up, entering into large dents; tertiaries obseure, but irregularly pereurrent, a few tertiaries branching off from the basal pair of seeondaries, entering into smaller marginal teeth; margin duplicate-serrulate, with aeute teeth ; texture thin, membranaceous: petiole thick.
