Amurodendron

Name

Amurodendron

Rank

Genus

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

Parent Taxon

[Family] Cupressaceae

Fossil Status

leafy twigs (with male cones)

Type

Amurodendron pilosum

Diagnosis

Shoots terminal. Leaves polymorphic: from scale-like to linear-lanceolate. Linear-lanceolate leaves arranged helically, curving at base to orient in roughly one plane, they decrease in size from base to apex of shoot; angle of leaf deviation up to 80°; petiolate long-decurrent bases leave oblique or parallel lines on shoot axis. Numerous hair-like teeth occur along leaf margin and on shoot axis. Midvein weakly expressed on both leaf surfaces. Scale-like leaves densely helically arranged, rhomboid. All leaves amphistomatic; stomata monocyclic or incompletely amphicyclic; anticlinal walls of epidermal cells straight. Pollen cones ellipsoidal in shape, terminally and laterally arranged; lateral cones arrange alternately or subopposite. Each pollen cone consists of helical to decussate, almost isometric microsporophylls. Pollen small to medium in size, rounded, with distal papilla, granular ectexine and lamellate endexine.