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Paisia
Genus Paisia Friis, M.M. Mendes, K.R. Pedersen Grana, 2018, 57(1-2): 4. 1 Jun 2017
- Name
- Paisia
- Rank
- Genus
- Authors (Pub.)
- Friis E. M.
Mendes M. M.
Pedersen K. R.
- Publication
- Paisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal [2017/6]
- Journal
- Grana
- Annee/Jahrgang
- 2018
- Volume
- 57
- Issue
- 1-2
- Page number
- 4
- Year
- 2017
- Parent Taxon
- [Class] Magnoliopsida
- Fossil Status
- flowers
- Type
- Paisia pantoporata
- Diagnosis
- Flower small, pedicellate,
actinomorphic, pentamerous and isomerous
and functional bisexual with one whorl of five tepals,
one whorl of five stamens and one whorl of five free
carpels, all opposite on the same radii. Receptacle
distinctly five-angled. Perianth of a single whorl of
five tepals; aestivation involute-valvate. Tepal base
extended downwards and margins incurved, clasping
the stamens. Stamens with a single massive bundle
extending from base to apex. Stamens differentiated
into a short, stout filament and an elongated, basifixed
anther. Anthers dithecate and tetrasporangiate;
sporangia minute, separated by a massive connective.
Anther dehiscence latrorse by longitudinal
slits. Pollen pantoporate, tectate-punctate, spiny.
Gynoecium superior; carpels free, sessile, elongate,
and plicate. Ovules many, borne in two longitudinal
rows on either side of the ventral suture. Stigma
sessile, decurrent, indistinct.
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