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Thodaya
Genus Thodaya Friis, P.R. Crane, K.R. Pedersen Int. J. Pl. Sci., 180(7): 000 [17] 659. 29 Jul 2019
- Name
- Thodaya
- 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 [17] 659
- Year
- 2019
- Parent Taxon
- [Phylum] Gnetophyta
- Fossil Status
- seeds
- Type
- Thodaya sykesiae
- Diagnosis
- Seeds borne three together in a linear
arrangement. Seeds small and orthotropous. Integument free
from seed envelope for its full length except at the base, where
it is broadly attached. Apex of nucellus composed of thinwalled
cells and a papillate depression (probable broad pollen
chamber). Integument extended apically into a long micropylar
tube formed by an inner and an outer epidermis. Micropylar
canal open apically, closed farther down by the cells of the
inner epidermis of the micropylar tube that are expanded radially
toward the center of the micropylar canal. Seed envelope
broadly elliptical in lateral view, elliptical in transverse
section, slightly pointed in the micropylar region. Outer surface
of the seed envelope almost smooth; outer epidermis of
narrow, longitudinally aligned cells covered by a thin cuticle.
Inner surface of the seed envelope in the micropylar region
smooth, without papillae. Seed envelope with an inner layer
of transversely elongate fibers, a middle layer of small, equiaxial,
thin-walled cells, and an outer zone of large, thin-walled cells.
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