Middle Devonian plants

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 spermatophytes, ancestral to both gymnosperms and angiosperms (flowering plants). 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. Tetraxylopteris is anoth

thumb|Wattieza casasii

Pertica is a genus of extinct vascular plants of the Early to Middle Devonian (around ). It has been placed in the "trimerophytes", a strongly paraphyletic group of early members of the lineage leading to modern ferns and seed plants.

Calamophyton is an extinct genus of tree, or "tree-sized plant", that was extant in the Middle Devonian period. As of 2024, a well-preserved fossilized forest of Calamophyton trees discovered in Somerset, England, represents the earliest-known forest.

The Archaeopteridaceae are an extinct family of plants belonging to Progymnospermae, and were dominant forest trees of the Late Devonian.

The Archaeopteridales are an extinct order of plants belonging to Progymnospermae, and dominant forest trees of the Late Devonian. They reproduced with spores rather than seeds. They were the evolutionary precursors of the conifers of gymnosperms which also include cycads and ginkgo.

genus of plants (fossil)