Progymnosperm
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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 gymnos
Archaeopteris
Aneurophytales
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The Aneurophytales are an extinct order of progymnosperms, considered among the earliest plants to produce true wood via a vascular cambium. They represent a crucial evolutionary link between simpler
Progymnosperm
…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 another example…
Aneurophyton germanicum