Archaeopteridales
F-arch-hibernica-fertile.jpg
  1. Archaeopteridales: (Devonian - Mississippian) Archaeopteris. Komponen utama hutan devon akhir, termasuk pohon raksasa pertama. Ovula dan serbuk sari tidak ada, namun memakai mega dan mikro spora

Bacaan lanjut

http://www.geol.umd.edu/~tholtz/G331/lectures/331plant.html
Scheckler, S.E. 1999. "Progymnosperms." pp. 992-995. In: R. Singer (ed.). Encyclopedia of Paleontology. Vol 2(M-Z) Chicago & London: Fitzroy Dearborn Publ.
Stewart, W.N and G.W. Rothwell. 1993. Paleobotany and the Evolution of Plants. Cambrige: Cambrige Univ. Press.

Sumber gambar
http://www.il.mahidol.ac.th/e-media/150charles-darwin/Less7_3_2_2_1.html

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