References
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Friis, E. M., Crane, P. R. & Pedersen, K. R. (2019): Geminispermum, an Early Cretaceous (early–middle Albian) cupulate unit from the angiosperm-dominated Puddledock flora of eastern North America. – Acta Palaeobotanica 59(2): 229–239.
Uhl, D. & Poschmann, M. (2018): Groenlandia pescheri sp. nov. (Potamogetonaceae) from the Late Oligocene Fossil-Lagerstätte Enspel (Westerwald, Germany). – Acta Palaeobotanica 58(1): 61–72.
Savoretti, A., Bippus, A. C., Stockey, R. A., Rothwell, G. W. & Tomescu, A. M. F. (2018): Grimmiaceae in the Early Cretaceous: Tricarinella crassiphylla gen. et sp. nov. and the value of anatomically preserved bryophytes. – Annals of Botany 121(7): 1275–1286.
Šimůnek, Z. (2007): Genus Cordaites from the Carboniferous and Permian of the Bohemian Massif (Epidermal structure study). – Acta Musei Nationalis Pragae, Series B – Historia Naturalis 62(2006)(3–4): 97–210.