Paisia E.M.Friis, M.M.Mendes et K.R.Pedersen
Plant Fossil Names Registry Number: PFN000704
Act LSID: urn:lsid:plantfossilnames.org:act:704
Reference: Friis, E. M., Mendes, M. M. & Pedersen, K. R. (2018): Paisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal. – Grana 57(1–2): 1–15.
Page of description: 4
Illustrations or figures: figs 1–6, 8
Paisia pantoporata E.M.Friis, M.M.Mendes et K.R.Pedersen
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.
In honour of Professor João Pais (1949–2016) for his contribution to the palaeobotany and geology of Portugal.