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Progymnospermophyta (Progymnosperms)

      The progymnosperms are an extinct group of woody, spore-bearing plants that is presumed to have evolved from the "trimerophytes", and eventually gave rise to the gymnosperms.[1] They have been treated formally at the rank of division Progymnospermophyta or class Progymnospermopsida (as opposite). The stratigraphically oldest known examples belong to the Middle Devonian order the Aneurophytales, with forms such as Protopteridium, in which the vegetative organs consisted of relatively loose clusters of axes.[2] Tetraxylopteris is another example of a genus lacking leaves. In more advanced aneurophytaleans such as Aneurophyton these vegetative organs started to look rather more like fronds,[3] and eventually during Late Devonian times the anuerophytaleans are presumed to have given rise to the pteridosperm order, the Lyginopteridales. In Late Devonian times, another group of progymnosperms gave rise to the first really large trees known as Archaeopteris.

Source: http://en.wikipedia.org/wiki/Progymnosperms


Source: http://biodidac.bio.uottawa.ca/thumbnails/filedet.htm?File_name=GYMN002B&File_type=GIF
Noeggerathia foliosaŠetlík (1956), Pl. III, fig. 1, 3, Pl. XIV. fig. 3 JŠ2
Noeggerathia foliosaŠetlík (1956), Pl. IX, fig. 2 JŠ16
Noeggerathia foliosaŠetlík (1956), Pl. XII, fig. 1 JŠ27
Noeggerathia foliosa JŠ32
Noeggerathia foliosaŠetlík (1956), Pl. VIII, fig. 1 JŠ37
Noeggerathia foliosaŠetlík (1956), Pl. VII, fig. 4 JŠ10
Noeggerathia foliosa JŠ21
Noeggerathia foliosaŠetlík (1956), Pl. XII, fig. 6, Pl. XIV, fig. 4 JŠ34
Noeggerathia foliosaŠetlík (1956), Pl. XIII, fig. 3 JŠ41
Noeggerathia foliosaŠetlík (1956), Pl. IV JŠ3
Noeggerathia foliosaŠetlík (1956), Pl. V, fig. 2 JŠ6
Noeggerathia foliosa JŠ12
Noeggerathia foliosaŠimůnek a Bek (2002) Pl. III, fig. 2-3 ZŠ71
Noeggerathia foliosaŠetlík (1956), Pl. IX, fig. 3 JŠ17
Noeggerathia foliosaŠetlík (1956), Pl. IX, fig. 7 JŠ22
Noeggerathia foliosaŠetlík (1956), Pl. X, fig. 2 JŠ25
Noeggerathia foliosaŠetlík (1956), Pl. XII, fig. 3 JŠ30
Noeggerathia foliosaŠetlík (1956), Pl. XVI, fig. 6 JŠ38
Noeggerathia foliosaŠetlík (1956), Pl. VIII, fig. 7, Pl. XIV, fig. 2 JŠ44
Noeggerathia foliosa JŠ58
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]