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Vascular Plants Without Seeds (The Megaphyll Line of Evolution:…
Vascular Plants Without Seeds
Early Vascular Plants
Rhyniophytes
Equal Dichotomous Branching
Branches are equal
Homosporous
Xylem Structure of Early Vascular Plants
Protostele
Xylem with no pith
Endarch Protostele
Protoxylem in center
Exarch Protostele
Metaxylem in center
Siphonostele
Pith in center
Seed Plants
no pith
Zosterophyllophytes
Herbs
No secondary growth
Enations
Outgrowths
Concepts
Dibiontic Life Cycle
Gametophyte and Sporophyte
Monobiontic
One multicellular generation
Interpolation Hypothesis
Sporophyte from mitotically
Transformation Theory
Large gametophyte and sporophyte
The Term "Vascular Cryptograms
Vascular TIssue
Lack seeds
Shared derived features
The Microphyll Line of Evolution: Lycophytes
Morphology
Microphylls
Increased photosynthesis
Heterospory
Cones
Clustered sporangia
Swampy areas
Extant Genera
Ligule
Small flap of tissue
Convergent evolution
Resistant to predators
The Megaphyll Line of Evolution: Euphyllophytes
Origins of Megaphylls (Euphylls)
Leaves from branch systems
Telome Theory
Megaphyll evolution
Telomes
Ultimate twigs
Sporophyll
Sporangium bearing
Euphullophytes
All megaphyllous plants
Monilophytes
Ferns
Trimerophytes
Overtopping
Unequal branching
Pseudomonpidial branching
Main trunk
Monilophytes
Equisetophytes
Horsetails
Sporaniophore
Umbrella-shaped
Monopodial growth
Main trunk and branches
Ferns
Leaf Trace
Small segment of cylinder
Leaf Gap
Just parenchyma
Sori
Clusters of sporangia
