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Sequoiadendron tchucoticum
Sequoiadendron tchucoticum A.B. Sokolova in A.B. Sokolova, M.G. Moiseeva Paleontol. Zhurn., 2016, (1): 94. 2016
- Name
- Sequoiadendron tchucoticum
- Rank
- Species
- Generic Name
- [Genus] Sequoiadendron
- Authors (Name)
- Sokolova A. B.
- Authors (Pub.)
- Sokolova A. B.
Moiseeva M. G.
- Publication
- Novyj vid roda Sequoiadendron Buchholz (Cupressaceae) iz verkhnemelovykh otlozhenij bassejna r. Enmyvaam (Tsentral'naya Chukotka) [2016]
- Journal
- Paleontologicheskii Zhurnal
- Annee/Jahrgang
- 2016
- Issue
- 1
- Page number
- 94
- Year
- 2016
- Fossil Status
- leafy twigs
- Stratigraphy
- Upper Cretaceous
- Strat. comment
- Santonian-Campanian
- Location
- mouth of the left tributary Emuneretveem River, upper reaches of Enmyvaam River, Tchukotka peninsula, Tchukotka Autonomous District, Russian Federation
- Paleoregion
- Eurasia (Far East)
Data for Holotypus
- Repository
- Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation
- Repository Number
- 3392/396
- Diagnosis
- Twigs irregularly spirally branched. Distance between branching nodes 2–10 mm. Leaves
spirally densely arranged. Three main types of leaves:
(1) appressed, scale-like, 1–3 × 1 mm; (2) subulate,
3–5 (8.5) × 1.8 mm, with long deccurent base and
acute triangular apex, upper half (third) deviating at
angle 15°; (3) falcate, 2–3 × 1.5 mm with pronounced
abaxial keel, long deccurent base, and acute apex; upper half deviating at angle 70°–90°; locate at base of
new branch. Leaves amphistomatic. Stomatal band
consists of 3–4 irregular rows on adaxial surface. Stomata amphicyclic with 6–7 subsidiary cells. Stomatal
aperture elliptic, mainly oblique, 25–30 × 15 μm.
Guard cells sunken. Ordinary epidermal cells rectangular, with tapered angles, longer and thinner near leaf
margins, 15–20 × 40–50 µm in median zones and up
to 10–15 × 90–100 (150) µm in marginal zones,
length/width ratio up to 15/1.
