chapter 21
vascular cryptogams
enations
horsetails
lingophytes
megaphylls
microphylls
protostele
rhyniophytes
sorus
leaf gap
telome theory
leaves that evoleved from branches
15 extant species
aka scouring rushes
lycophyta
fossils
no separate micro/megaspores
solid mass of xylem with no pith
outgrowths
ligule
small flap of tissue
megaphyll evolution
woody plants
underside of the leaf
ferns and fern allies
small segment of parenchyma
