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Chapter 21: Vascular Plants Without Seeds (The Megaphyll Line of Evolution…
Chapter 21: Vascular Plants Without Seeds
Concepts
Monobiontic
one multicellular generation
interpolation hypothesis
idea that a small sporophyte came mitotically
Dibiontic life cycle
extant plants cycles
transformation theory
Early Vascular Plants
Rhyniophytes
homosporous fossils
Zosterophyllophytes
small herbs without secondary growth
The Microphyll Lone of Evolution: Lycophytes
Heterospory
spres are clustered in cones or strobili
Extant Genera
common in forests, tropics, andthe arctic
Morphology
Earliest lycophytes were genera Drepanophycus and Baragwanathia
The Term "Vascular Cryptogams"
The Megaphyll Line of Evolution: Euphyllophytes
Equisetophytes
horsetails or scouring rushes: division Arthtophyta
Ferns
Monilophytes
mainly known as ferns
Origin of Megapylls
Trimerophytes
fossils that resemble rhyniophytes and have overtopping
