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Cedrus penzhinaensis
Cedrus penzhinaensis Blokhina, Afonin Acta Palaeobot., 47(2): 381. 20 Dec 2007
- Name
- Cedrus penzhinaensis
- Rank
- Species
- Generic Name
- [Genus] Cedrus
- Authors (Pub.)
- Blokhina N. I.
Afonin M. A.
- Publication
- Fossil wood Cedrus penzhinaensis sp. nov. (Pinaceae) from the Lower Cretaceous of north-western Kamchatka (Russia) [2007/12]
- Journal
- Acta Palaeobotanica
- Volume
- 47
- Issue
- 2
- Page number
- 381
- Year
- 2007
- Fossil Status
- wood (stems)
- Stratigraphy
- Albian
- Strat. comment
- Kedrovskaya Formation
- Location
- Malyi Unnavayam River (Talovka River Basin), eastern coast of the Penzhinskaya inlet, north-western Kamchatka Peninsula, Russian Federation
- Paleoregion
- Eurasia (Far East)
Data for Holotypus
- Repository Number
- 23/1-6
- Diagnosis
- Growth rings distinct. Pits in radial tracheid walls abundant, uni- or biseriate, 16–23(24) μm in diameter, biseriate pits mostly opposite or, occasionally, alternate. Crassulae present between biseriate opposite pits. Torus of pits “fringed”. Pits in tangential tracheid walls abundant, uni- or biseriate, 7–8 μm in diameter; biseriate pits more or less opposite or alternate. Axial (wood) parenchyma scanty; transverse walls smooth or with 2–4 small knots, both radial and tangential walls sometimes pitted. Uniseriate rays 1–10(16) cells in height, occasionally with 1–2 rows of biseriate. Ray tracheids smooth-walled, peripheral. Both vertical and horizontal resin canals traumatic. Vertical resin canals surrounded by 6–10 thick-walled epithelial cells, usually destroyed. Horizontal resin canals surrounded by 12–40 thick-walled epithelial cells and, in the same ray, by a different number (from one to three) of ray cell rings. Such resin canals occur in middle part of biseriate, bi-triseriate, triseriate, tri-quadriseriate or quadriseriate rays, with equal (of 1–3 cells) or extremely unequal uniseriate ends: shorter ones consist of 1–3 and longer ones of 4–10 cells. There are 2–4(5) cupressoid or taxodioid pits of 4–6 μm in diameter per cross-field.
