Literature

Authors	Year	Title
J. Hilton, Bateman R. M.	2006	Pteridosperms are the backbone of seed-plant phylogeny
A. C. Seward	1917	Pteridospermae, Cycadofilices, Cordaitales, Cycadophyta
A. B. Doweld	2001	Prosyllabus Tracheophytorum. Tentamen systematis plantarum vascularium (Tracheophyta)
S. Archangelsky, Cúneo R.	1990	Polyspermophyllum, a New Permian Gymnosperm form Argentina, with Considerations about the Dicranophyllales
L. M. Bowe, Coat, G., dePamphilis, C. W.	2000	Phylogeny of the seed plants based on all three genomic compartments: extant gymnosperms are monophyletic and a close Gnetales-conifer relationship
C. - Y. Qiao, Ran, J. - H., Li, Y., Wang, X. - Q.	2007	Phylogeny and biogeography of Cedrus (Pinaceae) inferred from sequences of seven paternal chloroplast and maternal mitochondrial DNA regions
G. Mapes, Rothwell G. W.	1984	Permineralized ovulate cones of Lebachia from Late Palaeozoic limestones of Kansas
G. Playford, Rigby J. F.	2008	Permian palynoflora of the Ainim and Aiduna formations. West Papua
S. V. Meyen	1997	Permian conifers of Western Angaraland
M. Stephenson, Osterloff, P. L., Filatoff, J.	2003	Palynological biozonation of the Permian of Oman and Saudi Arabia: progress and challenges
K. M. Parris, Drinnan, A. N., Cantrill, D. J.	1995	Palissya cones from the. Mesozoic of Australia and New Zealand
R. Florin	1927	Paleozoic conifers
T. G. Halle	1927	Palaeozoic plants from Central Shansi
W. Nichols Stewart, Rothwell G. W.	1993	Palaeobotany and the evolution of plants
R. M. Bateman, Hilton J.	2009	Palaeobotanical systematic for the phylogenetic age: applying organ-species, form-species and phylogenetic species concepts in a framework of reconstructed fossil and extant whole-plants
G. Thomas Burnett	1835	Outlines of Botany, including a General history of the Vegetable Kingdom, in which plants are arranged according to the system of natural affinities
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R. Florin	1940	On Walkomia n. gen., a genus of Upper Palaeozoic conifers from Gondwanaland
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M. Barthel, Noll R.	1999	On the growth habit of Dicranophyllum hallei Rémy & Rémy
F. D. Reed	1946	On Cardiocarpon and some associated plant remains from Iowa coal fields
J. Wang, Pfefferkorn H. W.	2010	Nystroemiaceae, a new family of Permian gymnosperms from China with an unusual combination of features
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J. A. Clement-Westerhof	1988	Morphology and phylogeny of Palaeozoic conifers
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A. B. Leslie	2008	Interpreting the function of saccate pollen in ancient conifers and other seed plants
G. Ogg	2009	International Stratigraphic Chart
C. N. Miller, Jr	1999	Implications of Fossil Conifers for the Phylogenetic Relationships of Living Families
J. A. Clement-Westerhof, Van Cittert J. H. A. van	1991	Hirmeriella muensteri: new data on the fertile organs leading to a revised concept of the Cheirolepidiaceae
G. W. Rothwell, Mapes, G., Hernandez-Castillo, G. R.	2005	Hanskerpia gen. nov. and phylogenetic relationships among the most ancient conifers (Voltziales)
S. V. Meyen	1988	Gymnosperms of the Angara Flora
C. J. Cleal	1993	Gymnospermophyta
G. R. Hernandez-Castillo, Rothwell, G. W., Stockey, R. A., Mapes, G.	2003	Growth architecture of Thucydia mahoningensis, a model for primitive walchian conifer plants