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Hamamelidoxylon obiraense
Hamamelidoxylon obiraense K. Takah., Mits. Suzuki I.A.W.A. J., 24(3): 280. 2003
- Name
- Hamamelidoxylon obiraense
- Rank
- Species
- Generic Name
- [Genus] Hamamelidoxylon
- Authors (Pub.)
- Takahashi K.
Suzuki M.
- Publication
- Dicotyledonous fossil wood flora and early evolution of wood characters in the Cretaceous of Hokkaido, Japan [2003]
- Journal
- IAWA Journal
- Volume
- 24
- Issue
- 3
- Page number
- 280
- Year
- 2003
- Fossil Status
- stems (wood)
- Stratigraphy
- Coniacian
- Strat. comment
- Unknown, "probably Coniacian to Santonian"
- Location
- Obirashibe River, Obira-cho , Rumoi County, Hokkaido, Japan
- Paleoregion
- Eurasia (Japanese Archipelago)
Data for Holotypus
- Repository
- Botanical Garden, Tohoku University, Sendai, Japan
- Repository Number
- OG 97021
- Diagnosis
- Growth rings distinct, marked by differences in vessel size. Wood diffuse-porous. Vessels very numerous, 83-120 (mean 100) per square mm; predominantly solitary (70%) and in radial or rarely in tangential pairs; round, somewhat angular in cross section; 40-65 (mean 52) x 40-105 (mean 60) um in tangential x radial diameter; 640-1200 (mean 951) pm in vessel element length; perforation plates exclusively scalariforrn with 22-56 bars; intervessel pits opposite to scalariforrn, elliptical, horizontally elongated, 15 x 2.5 pm in radial x vertical diameter; vessel-ray pits similar to intervessel pits. Imperforate tracheary elements fiber-tracheids with distinctly bordered pits.
Axial parenchyma diffuse, no crystalliferous elements observed. Rays mostly (93%) uniseriate and rarely biseriate; 350 pm-2.1 mm high; markedly heterocellular with 1-4 marginal rows of upright or square cells; procumbent cells 90 x 15 um in radiallength x height; upright cells 30 x 50 um in radial length x height; no crystalliferous elements observed.
