Pertica
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Pertica is a genus of extinct vascular plants of the Early to Middle Devonian. It has been placed in the "trimerophytes", a strongly paraphyletic group of early members of the lineage leading to moder
Pertica quadrifaria reconstruccion
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
Pertica
…which have such leaves. Other researchers have produced rather different analyses. Rothwell's analysis separates "trimerophytes", like Pertica, from progymnosperms, like Tetraxylopteris, with only the latter being closely related to seed plants…
Archaeopteris