IDNAME urn:idName:fossilplants.info:supragenus:B9C9B41F-7BDD-3FC9-2AA6-E56661C280D8 supragenus
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Vladimariales

Order Vladimariales Gordenko Paleontol. J., 44(10): 1282. Dec 2010
Name
Vladimariales
Rank
Order
Authors (Pub.)
Gordenko N. V.  
Publication
Vladimariales ordo nov. (Gymnospermae) from the Middle Jurassic deposits of the Mikhailovskii rudnik locality (Kursk Region, European Russia) [2010/12]
Journal
Paleontological Journal
Volume
44
Issue
10
Page number
1282
Year
2010

Parent Taxon
[Class] Ginkgoopsida
Type
[Genus] Vladimaria
Diagnosis
Plants with peltate, radially sym metrical seedbearing organs–composite capsules, formed by fusion of several closed elementary cap sules, which arranged in whorl on thin axis and inverted relative to it and base of composite capsule. Composite capsule dehisced on several lobes along line of fusion of elementary capsules. Each capsule contained solitary seed. Seeds, sitting on short stalks, inverted relative to composite capsule axis. Seeds fusi form, slightly curved, with chalaza slightly asymmetri cal and weakly concave in place of stalk attachment; micropile very long, with apex fused to margins of small opening in distal margin of capsule. Nucellus fused with integument more than on two thirds, megaspore membrane absent. Axis base of composite capsule sustained by collar on thick stalk, protecting micropilar tips of seeds. Stalk with several radially arranged collateral vascular bundles. Their quantity corresponds to quantity of elementary capsules, form ing composite capsule. Metaxylem tracheids in vascu lar bundles with scalariform bordered pits. Extensive resin canals and cavities presented in cortex of stalk, collar, and composite capsule. Outer epidermis of composite capsule strongly cutinized, bearing numer ous perigenous mono or polycyclic stomatal appara tuses, without sutures, despite of area sustained by col lar, where radially arranged sutures distinctly expressed on cuticle. Sutures mark lines of fusion of capsules. Stalk, bearing collar, upper surface of collar near its axial part, composite capsule axis, and all area of composite capsule sustained by collar, papillose; other surface of composite capsule without papillae.


Links by parent

Supragenus
Family Vladimariaceae

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