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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
Acitheca polymorphaŠimůnek (2022), PL. 1, Fig. 2 ZŠ878
Acitheca pseudobucklandii ZŠ169
Aneurophyton bohemicum XA248
Aneurophyton bohemicum p5097
Archeonoeggerathia schatzlarensisŠimůnek a Bek (2002), Pl. XII, fig. 3, 4, 5, 6 ZŠ69
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 6, fig. 5 Ich6420
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 6, fig. 3 Ich6418
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 4, fig. 3 Ich6414
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 6, fig. 4foto Ich6419
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 5, fig. 1 Ich6415
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 5, fig. 2 Ich6417
Chlupacia moravica Obrhel, 1967Oberhel (1975), Pl. 6, fig. 2 Ich6421
Discinites jongmansiiŠimůnek (2002), Pl. 1, 2 ZŠ77
Discinites WA198
Discinites WA201
Discinites ZŠ431
Lonchopteris bracei p1473
Noeggerathia foliosa ZŠ776
Noeggerathia foliosa ZŠ765
Noeggerathia foliosa ZŠ754
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]