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Vascular Plants Without Seeds - Coggle Diagram
Vascular Plants Without Seeds
Concepts
Dibiontic Life Cycle
Multicellular Gametophyte
Multicellular Sporophyte
All known fossil plants
Postulates : small sporophyte came into existence when a zygote germinated mitotically
More Complex
Vascularized
Larger
Life cycle with alteration of isomorphic generation
Early Vascular Plants
Rhyniophytes
Earliest Fossil Record of Land Plants
Cooksonia Genius of Extinct Plants
Simple Upright Stems
With no leaves
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equal dichotomus branching
both branches
equal size
epidermis
Simple bundle of xylem
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cortex of parenchyma
Xylem Structure of Early Vascular Plants
Siphonostele
evolved later
pith is present in center
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endarch protostele
protoxylem located in center
metaxylem differentiates on outer edge
exarch protostele
metaxylem located in center
Protoxylem on edges
Protostele
solid mass of xylem
no pith
Zossterophyllophytes
small herbs
Lateral Sporangia
Opened transversely along top edge
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exarch protostele
no secondary growth
enations
outgrowths
increased photosynthetic surface area
in asteroxylon
The Microphyll Line of Evolution
Exarch Protosteles
May have come from Ancestor
Lateral Sporangia
Morphology
Micropylls
compact groups of sporangia
lycophyll has been suggested
Heterospory
Cones or strobili
Compact groups of sporangia
Extant Genera
selgaginella
resurrection Plant
heterosporous
ligule
small flap of tissue
Lycopodium
Fairly common in Forests
200 living species true roots
short upright branches
Tropical Regions to Arctic
homosporous
spores germinate bisexual gametophytes
produce
antheridia
archegonia
The Term " Vascular Cryptogams "
" Ferns and fern allies"
They have Vascular Tissue
Reproduction is hidden
