progymnosperm

(redirected from Archaeopteris)
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Related to Archaeopteris: lycopsids
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Words related to progymnosperm

an ancestral fossil type from which modern gymnosperms are thought to have derived

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References in periodicals archive ?
Archaeopteris shed its foliage often, possibly in response to the same stressful environmental conditions that led to the wildfires, says Mary L.
Scientists speculate that a group of Archaeopteris may have formed the planet's first forests, creating a new environment for emerging land animals.
New fossil findings show that Archaeopteris also had permanent branches and lived as long as 50 years.
On the other hand, results obtained here [ILLUSTRATION FOR FIGURES 2 & 4 OMITTED] do not support the alternative hypothesis that Ophioglossales is derived from the progymnosperms, such as Archaeopteris (e.