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Cunninghamia shangcunica
Cunninghamia shangcunica Kodrul, Gordenko, A.B. Sokolova in Kodrul, Gordenko, A.B. Sokolova, N.P. Maslova, X.-K. Wu, J.-H. Jin Rev. Palaeobot. Palynol., 258: 235. 6 Sep 2018
- Name
- Cunninghamia shangcunica
- Rank
- Species
- Generic Name
- [Genus] Cunninghamia
- Authors (Name)
- Kodrul T. M.
Gordenko N. V.
Sokolova A. B.
- Authors (Pub.)
- Kodrul T. M.
Gordenko N. V.
Sokolova A. B.
Maslova N. P.
Wu X.-K.
Jin J.-H.
- Publication
- A new Oligocene species of Cunninghamia R. Brown ex Richard et A. Richard (Cupressaceae) from the Maoming Basin, South China [2018/9]
- Journal
- Review of Palaeobotany and Palynology
- Volume
- 258
- Page number
- 235
- Year
- 2018
- Fossil Status
- leafy twigs
- Stratigraphy
- Rupelian
- Strat. comment
- Shangcun Formation
- Location
- Lishan Village vicinity, ~25 km northwest of Maoming City, Guangdong Province, China
- Paleoregion
- Eurasia (China)
Data for Holotypus
- Repository
- Museum of Biology, Sun Yat-Sen University, Guangzhou, China
- Repository Number
- MM3A-250
- Diagnosis
- Shoots with densely and helically arranged and radially spread leaves. Shoot axis straight or slightly curved. Leaves polymorphic, from short appressed lanceolate to linear-lanceolate and falcate. Size of leaves and angle of leaf divergence decrease from base to top of shoot. Angle of leaf divergence reaches 45°. Leaves 10–30 mm long and 1.5–4.0 mm wide; free parts of leaves 6–22 mm long. Leaf bases long decurrent, slightly keeled, almost untapered towards the axis, not twisted; apices blunt or shortly acuminate, incurved or straight. Leaf margins serrulate. Leaves hypostomatic; occasionally with amphistomatic leaf bases. Adaxial epidermis consists of rectangular and trapezoid, rarely triangular, longitudinally oriented cells. Anticlinal cell walls appear undulate because of knob-like cuticle thickenings on these walls. Abaxial epidermis composed of two stomatal bands of uneven width (each 150–700 μm wide), broad costal zone (up to 1300 μm) and two marginal zones (up to 600 μm wide). Each stomatal band typically (2) 6–12 (14) stomata wide. Stomata oriented irregularly, mainly obliquely, rarely longitudinally, occasionally transversely. Stomata monocyclic or incompletely amphicyclic with six to seven (rarely five or eight) subsidiary cells, guard cells sunken.
