The INTERNATIONAL FOSSIL PLANT NAMES INDEX
Global registry of scientific names of fossil organisms covered by the International Code of Nomenclature for Algae, Fungi, and Plants and the International Code of Zoological Nomenclature © 2014-2024

IDNAME urn:idName:ifpni.org:species:D7C8937B-58B8-4421-7B83-8703DE69C488 species
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Amurodendron pilosum

Amurodendron pilosum A.B. Sokolova, Zavial., M.G. Moiseeva, Kodrul Paleontol. J., 57: 1190. Dec 2023
Name
Amurodendron pilosum
Rank
Species
Generic Name
[Genus] Amurodendron
Authors (Pub.)
Sokolova A. B. Zavialova N. E. Moiseeva M. G. Kodrul T. M.  
Publication
The new genus Amurodendron (Cupressaceae s.l.) from the Paleocene Boguchan flora of the Amur Region (Russian Far East) [2023/12]
Journal
Paleontological Journal
Volume
57
Page number
1190
Year
2023
Fossil Status
leafy twigs (with male cones)
Stratigraphy
Paleocene
Strat. comment
Middle Tsagayan subformation of Tsagayan Formation
Location
Arkhara-Boguchan coal field (49°18.780′ N, 130°12.808′ E), Amur Region, Russian Federation
Paleoregion
Eurasia (Far East)
Data for Holotypus
Repository Number
GIN 4867, specimen no. AB1–492
Num
Pl. 11, Fig. 7; Pl. 13, Figs. 1–5; Pl. 14, Figs. 1–5; Pl. 15, Figs. 1–6; Pl. 16, Figs. 1–4, 6, 10; Pl. 17, Figs. 1–4; Pl. 18, Figs. 1–4; Figs. 2c, 2d
Pub.
The new genus Amurodendron (Cupressaceae s.l.) from the Paleocene Boguchan flora of the Amur Region (Russian Far East) [2023/12]
Diagnosis
Shoots terminal. Leaves polymorphic: from scale-like to linear-lanceolate. Shoot axis 0.7–1.0 mm. Linear-lanceolate leaves 6.0–16.0 × 1.0–1.5 mm, decrease from base to apex of shoot; helically arranged, curving at base to orient in roughly one plane; angle of leaf deviation up to 80°; long-decurrent bases leave oblique to parallel lines on shoot axis. Numerous hair-like teeth 20–200 × 10–20 μm locate along leaf margin and on shoot axis. Scale-like leaves helically arranged, rhomboid; 1.0–5.0 × 1.0–2.5 mm; free part of leaves triangular. Scale-like leaves locate at bases of shoots and on axes bearing pollen cones. All leaves amphistomatic; stomata monocyclic or incompletely amphicyclic; anticlinal walls of epidermal cells straight. In linear leaves two stomatal bands consist of one to six stomata per width on abaxial surface and up to three to four on adaxial surface; predominantly longitudinally oriented stomata form discontinuous rows; epidermal cells of non-stomatal zones arrange in regular rows parallel to leaf margins; their length/width ratio about 11/1. In scale-like leaves stomatal bands with two to four stomata per width in middle part of leaf, consist of irregularly oriented stomata. Pollen cones ellipsoidal, terminal or lateral, 5.5–7.5 × 3.0– 3.5 mm; lateral cones arrange alternately or subopposite; each lateral cone supported by thin saber-like leaf up to 5 mm long, curved towards axis. Each cone consists of 10–14 rhomboid microsporophylls helically to decussately arranged. Pollen grains 23–27 μm in size, rounded, with small distal papilla. The ectexine with tectum of fused granules, infratectum of smaller loosely arranged granules and thin foot layer, and the endexine with six lamellae.
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