References
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Banerji, J. & Ghosh, A. K. (2006): Podospermum gen. et sp. nov., an Acmopyle-like dispersed silicified ovule/seed from Lower Cretaceous intertrappean beds of the Rajmahal Basin, India. – Cretaceous Research 27(5): 707–711.
Cevallos-Ferriz, S. R. S. & Stockey, R. A. (1989): Permineralized fruits and seeds from the Princeton Chert (Middle Eocene) of British Columbia: Nymphaeaceae. – Botanical Gazette 150(2): 207–217.
Pedersen, K. R., Crane, P. R. & Friis, E. M. (1989): Pollen organs and seeds with Eucommiidites pollen. – Grana 28: 279–294.
Anderson, J. M. & Anderson, H. M. (1989): Palaeoflora of Southern Africa. Molteno Formation (Triassic). Vol. 2. Gymnosperms (excluding Dicroidium). A. A. Balkema, Rotterdam, Brookfield: 567 pp.
Brousmiche, C. (1986): Précisions sur les spores produites par quelques fougères sphénoptéridiennes appartennant aux genres Boweria Kidston, Crossotheca Zeiller, Discopteris Stur, Myriotheca Zeiller et Urnatopteris Kidston. – Revue de Paléobiologie 5(2): 231–248.
Smiley, C. J. & Huggins, L. M. (1981): Pseudofagus idahoensis, n. gen. et sp. (Fagaceae) from the Miocene Clarkia flora of Idaho. – American Journal of Botany 68(6): 741–761.
Freudenthal, T. (1964): Palaeobotany of the Mesophytic I. Palynology of Lower Triassic Rock Salt, Hengelo, The Netherlands. – Acta Botanica Neerlandica 13(2): 209–236.
Brown, R. W. (1962): Paleocene flora of the Rocky Mountains and Great Plains. – Professional Papers, United States Geological Survey 375: 1–119, 69 pls.
Graham, R. (1935): Pennsylvanian flora of Illinois as revealed in coal balls. II. – Botanical Gazette 97(1): 156–168.
Miner, E. L. (1935): Paleobotanical examinations of Cretaceous and Tertiary coals. – The American Midland Naturalist 16(4): 585–625.
Graham, R. (1934): Pennsylvanian flora of Illinois as revealed in coal balls. I. – Botanical Gazette 95(3): 453–476.
Brongniart, A. T. (1828): Prodrome d'une histoire des végétaux fossiles. F. G. Levrault, Paris and Strasbourg: 223 pp.