Back
Ginkgo ragosinii
Ginkgo ragosinii Nosova, Golovn. in Golovn., Nosova Al'b-Senom. Fl. Zap. Sibiri 93. 2012
- Name
- Ginkgo ragosinii
- Rank
- Species
- Generic Name
- [Genus] Ginkgo
- Authors (Name)
- Nosova N. V.
Golovneva L. B.
- Authors (Pub.)
- Golovneva L. B.
Nosova N. V.
- Publication
- Al'b-senomanskaya flora Zapadnoj Sibiri [2012]
- Authors (Book)
- Golovneva L. B.
Nosova N. V.
- Book
- Al'b-senomanskaya flora Zapadnoj Sibiri
- Page number
- 93
- Year
- 2012
- Fossil Status
- foliage
- Stratigraphy
- Cenomanian
- Strat. comment
- Simonovian suite
- Location
- Sym River, 30km from the mouth, Tchulym-Yenisej, Krasnojarsk Territory, Russian Federation
- Paleoregion
- Eurasia (W Siberia)
Data for Holotypus
- Repository
- Komarov Botanical Institute, Russian Academy of Sciences, St.-Petersburg, Russian Federation
- Repository Number
- № 516/9
- Diagnosis
- Leaves bilobed, cuneate, with long petiole. Lamina is divided on ⅓—½ of
length into two parts. Apical lamina margin entire, with several shallow incisions. Leaves amphistomatic.
Anticlinal cell walls straight or sinuous. Periclinal cell walls of upper epidermis
smooth or with one to several round cuticular thickenings. Stomata of upper epidermis rare.
Subsidiary cells with small proximal papillae not covering stomatal pit. Occasionally trichome
bases occur. Periclinal cell walls of lower epidermis usually with one to several large papillae,
often joined. Subsidiary cells of stomata of lower epidermis with proximal papillae partly or
entirely covering stomatal pit, or, rarely, not covering it.
