Kvacekispermum E.M.Friis, P.R.Crane et K.R.Pedersen
Plant Fossil Names Registry Number: PFN000106
Act LSID: urn:lsid:plantfossilnames.org:act:106
Reference: Friis, E. M., Crane, P. R. & Pedersen, K. R. (2018): Rightcania and Kvacekispermum: Early Cretaceous seeds from eastern North America and Portugal provide further evidence of the early chloranthoid diversification. – Fossil Imprint 74(1–2): 65–76.
Page of description: 71
Kvacekispermum rugosum E.M.Friis, P.R.Crane et K.R.Pedersen
Seeds broadly obovate in lateral view and almost circular in transverse section with coarsely rugulate to reticulate surface formed from the uneven outer surface of endotesta in which the depressions are arranged in poorly defined grooves. Stigmatic area sessile on the fruit apex, slightly raised, hemispherical. Ovule pendent, orthotropous, bitegmic, endotestal. Endotesta comprised of a single layer of palisade-shaped cells with densely spaced crystals and fibrous infillings. Tegmen crushed in mature seeds. Embryo tiny; nutritive tissue of isodiametric thin-walled cells.
The name Kvacekispermum is in honor of Zlatko Kvaček for his numerous contributions to palaeobotany.