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Rothwellia
Genus Rothwellia Friis, P.R. Crane, K.R. Pedersen Int. J. Pl. Sci., 180(7): 000 [9] 651. 29 Jul 2019
- Name
- Rothwellia
- 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 [9] 651
- Year
- 2019
- Parent Taxon
- [Phylum] Gnetophyta
- Fossil Status
- seeds
- Type
- Rothwellia foveata
- 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 extended apically
into a long micropylar tube. Micropylar tube formed by an
inner and an outer epidermis. Micropylar canal open apically,
closed farther down by the cells of the inner epidermis that expand
radially toward the center of the canal. Seed envelope ellipsoidal,
four angled to almost circular in transverse section. Surface
of seed faintly rugulate-foveolate. Micropylar region of seed
envelope only slightly extended. Inner surface of the seed envelope
in the micropylar region smooth, lacking papillae. Outer
epidermis of seed envelope of polygonal, longitudinally aligned
cells with a thin cuticle. Sclerenchyma zone of seed envelope with
an inner layer of narrow, transversely elongate cells and an outer
layer of shorter, radially extended cells with unevenly thickened
walls. Zone of parenchyma cells present between the sclerenchyma
layer and the outer epidermis. Embryo with two cotyledons.
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