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Ginkgo shiguaiensis
Ginkgo shiguaiensis C.-L. Sun, Dilcher, H.-S. Wang, Y.-H. Ge Int. J. Pl. Sci., 169(8): 1132. Oct 2008
- Name
- Ginkgo shiguaiensis
- Rank
- Species
- Generic Name
- [Genus] Ginkgo
- Authors (Pub.)
- Sun C.-L.
Dilcher D. L.
Wang H.-S.
Ge Y.-H.
- Publication
- A study of Ginkgo leaves from the Middle Jurassic of Inner Mongolia, China [2008/10]
- Journal
- International Journal of Plant Sciences
- Volume
- 169
- Issue
- 8
- Page number
- 1132
- Year
- 2008
- Fossil Status
- foliage
- Stratigraphy
- Middle Jurassic
- Strat. comment
- Zhaogou Formation
- Location
- Toudaogou-Erdaogou section, Shiguai Coal
Mine, Inner Mongolia, China
- Paleoregion
- Eurasia (China)
Data for Holotypus
- Repository
- Research Center of Palaeontology and Stratigraphy, Jilin University, Changchun, China
- Repository Number
- S001
Data for Paratypus
- Repository
- Research Center of Palaeontology and Stratigraphy, Jilin University, Changchun, China
- Repository Number
- S003, S008, S009
- Diagnosis
- Leaf semiorbicular or fan shaped with a long and
slender petiole. Basal angle of leaves 80–220. Lamina 30–40 mm
long by 60–70 mm wide, usually divided into two halves, each
half subdivided into two main lobes. Outer lobes usually deeply
notched or divided into ultimate lobes. Lobe shape varying from
lanceolate to narrow obovate with rounded or obtuse rounded
apexes. Veins distinct, 10–12 per 5 mm.
Leaf sparsely amphistomatic (only a few stomata on the upper
epidermis). The thickness of cuticle on the upper and lower
epidermis almost the same; thickenings uneven on periclinal
and anticlinal walls of epidermal cells, no papillae or trichomes
observed. Stomata similar on upper and lower epidermis, randomly
oriented in stomatal zones. Cuticular thickenings present
on anticlinal walls bordering the stomata and apparent
cuticular striations extending out from the stomata. Conspicuous
papillae present on subsidiary cells and extending over stomatal
pit. Typically, four to six subsidiary cells surrounding
the guard cells.
