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Vascular Plants Without Seeds (Cocepts (dibiontic life cycle (each species…
Vascular Plants Without Seeds
Cocepts
dibiontic life cycle
all extant plants
all known fossil plants
each species
multicellular sporophyte
multicellular gametophyte
monobiontic
some algae
especially Coleochate
one multicellular generation
zygote - only meiosis
:red_cross:mitosis
:red_cross:sporophyte
more spores that becomes gametophyte
conversion of monobiontic to dibiontic
important :red_flag:
sporophyte generation had to come into existence
The Microphyll Line of Evolution
Morphology
earliest lycophytes
Drepanophycus
Baragwanathia
enations were large
increase photosynthesis
Microphylls
enations in division lycopyta
Heterospory
Cones or Strobili
cluster of lycophytes sporangia
The Megaphyll Line of Evolution
Early Vascular Plants
Rhyniophytes :warning:
equal dichotomous brnching
equal size and vigor
Cooksonia
epidermis w/ cuticle
w/ cortex of parenchyma
simple bundle of xylem
tracheids
annular secondary walls
ends of the branches - swollen
large, multicellular masses of sporogenous tissue
Aglaophyton
Phynia
Xylem Structure of Early Vascular Plants
Early vascular plants
2 xylem organizations
both - no pith
protostele
endarch protostele
Zosterophyllophytes
early vascular plants
similar to rhyniophyte
sporangia - lateral
opened transversely
The term "Vascular Cryptogams"
Vascular cryptogams
ferns and fern allies
vascular tissues
lack seeds - reproduction hidden
