chapter 21 vascular plants without seeds
dibiontic life cycle
monobiontic
equal dichotomous branching
interpolation hypothesis
transformation theory
rhyniophytes
xylem structure
protostele
endarch protostele
exarch protostele
siphonostele
seed plants
zosterophyllophytes
enations
microphylls
timerophytes
overtopping
pseudomonopodial branching
telome theory
planation
megaphylls
telomes
webbing
sporophyll
euphyllophytes
euphyllophytes
monilophytes
equiestophytes
lignophytes
horse tails
or scouring rushes
sporangiophore
leaf trace
leaf gap