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Riaselis
Genus Riaselis Friis, P.R. Crane, K.R. Pedersen Int. J. Pl. Sci., 180(2): 113. 4 Jan 2019
- Name
- Riaselis
- Rank
- Genus
- Authors (Pub.)
- Friis E. M.
Crane P. R.
Pedersen K. R.
- Publication
- Extinct diversity among Early Cretaceous angiosperms: mesofossil evidence of early Magnoliales from Portugal [2019/1]
- Journal
- International Journal of Plant Sciences
- Volume
- 180
- Issue
- 2
- Page number
- 113
- Year
- 2019
- Parent Taxon
- [Class] Magnoliopsida
- Fossil Status
- fruits
- Type
- Riaselis rugosa
- Diagnosis
- Fruit/fruitlet indehiscent, with a thin
wall; one seeded. Style lacking. Inner layer of fruit wall with
narrow, elongate fibers. Stigmatic area restricted. Seed small,
anatropous, bitegmic, and mesotestal-endotestal, with thick
outer integument (testa) and thin inner integument (tegmen).
Mesotesta one cell layer thick, composed of larger sclerenchyma
cells. Endotesta several cell layers thick, composed of
small polygonal cells with endoreticulate infillings. Seed surface
coarsely rugulate.Micropyle formed from inner integument. Hilum
and micropyle close together, not separated by testal tissue,
resulting in a wide transversely oriented micropylar-hilar opening
in the testa. Ovular vascular bundle continuing beyond the
chalaza on the antiraphal side of the seed to the micropyle. Embryo
tiny. Endosperm cellular, not-ruminate.
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