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Related to Archaeopteris: lycopsids
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Noun1.progymnosperm - an ancestral fossil type from which modern gymnosperms are thought to have derived
gymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary
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These were characterised by cosmopolitan plant genera such as the progymnosperm tree Archaeopteris, which has also been described from Waterloo Farm (Anderson et al.
'Previously, paleobotanists thought that a tree called Archaeopteris was the oldest tree.
Formation Age Age Criteria Perry Upper Devonian Archaeopteris: Upper Devonian (Kasper et al.
Much of the unburned foliage comes from Archaeopteris, the first known tree to live en masse in forests, but none of the charcoal has been linked to this plant.
But until the appearance of Archaeopteris (or "ancient fern) 370 million years ago, scientists think Earth had no shade at all.