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:genus:C47DA8A4-48E0-CE3C-9911-516105AE40FD genus
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Arazedispermum

Genus Arazedispermum Friis, P.R. Crane, K.R. Pedersen Int. J. Pl. Sci., 180(7): 000 [13] 655. 29 Jul 2019
Name
Arazedispermum
Rank
Genus
Authors (Pub.)
Friis E. M. Crane P. R. Pedersen K. R.  
Publication
Chlamydospermous seeds document the diversity and abundance of extinct gnetalean relatives in early cretaceous vegetation [2019/7]
Journal
International Journal of Plant Sciences
Volume
180
Issue
7
Page number
000 [13] 655
Year
2019
Parent Taxon
[Phylum] Gnetophyta
Fossil Status
seeds
Type
Arazedispermum lusitanicum
Diagnosis
Seeds small and orthotropous. Integument free from the seed envelope for its full length except at the base, where it is broadly attached. Integument apically extended into a long micropylar tube formed by an inner and an outer epidermis. Micropylar canal open apically but closed farther down by the cells of the inner epidermis that expand radially toward the center of the canal. Seed envelope broadly elliptical in lateral view, elliptical and weakly four angled in transverse section, extended in the micropylar region into a short central projection supporting the micropylar tube. Outer surface of seed envelope almost smooth; outer epidermis of equiaxial cells covered by a thick cuticle. Inner surface of seed envelope smooth in the micropylar region, lacking papillae. Sclerenchyma zone of seed envelope consisting of an inner layer of equiaxial stone cells; a middle layer of narrow, radially and longitudinally extended cells; and an outer layer of very small isodiametric cells.
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