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Vascular Plants without Seeds - Coggle Diagram
Vascular Plants without Seeds
dibiontic life cycle: each species has a multicellular gametophyte and also a multicellular sporophyte
some algae are monobiontic: have one multicellular generation
interpolation hypothesis: postulates that a small sporophyte came into existence when a zygote germinated mitoticaly instead of meiotically
transformation theory: postulates that after the dibiontic life cycle originated both gametophyte and sporophyte became larger more complex and vascularized in a life cycle with an alternation of isomorphic generations
equal dichotomous branching: both branches being of equal size and vigor
rhyniophytes: fossils that are homosporous but had no separate microspores and megaspores
protostele: center is a solid mass xylem with no pith
endarch protostele: protoxylem is located in the center and metaxylem differentiates on the outer edge of the xylem mass
exarch protostele: metaxylem located in the center of the xylem mass and protoxylem on the edges as several groups next to the phloem
siphonostele: where the pith is present in the center
zosterophyllophytes: small herbs without secondary growth
enations: outgrowths on some zosterophyllophytes that were ranged from small to long thin scales
microphylls: enations in the division Lycophyta
megaphylls: leaves that evolved from branch systems and are present in all seed plants, ferns, and equietophytes
sporophyll: sporangium bearing leaf like structure
euphyllophytes: megaphyllous plants form a monophyletic clade
sporangiophore: has a short stalk and a flat shield shaped head; reproductive structure
monopodial growth: main trunk lateral branches true leaves and true roots
leptosporangiate ferns: single surface cell divides periclinally and forms a small outward protrusion
vascular cryptogams: they have a vascular tissue and their reproduction is hidden
