tracheophytes: the vascular plants xxylem (for transporting water and mineral nutrients) pphloem...
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Tracheophytes: The Vascular Plants xylem (for transporting water and mineral
nutrients)
phloem (for transporting sugars from leaves to the rest of the plant)
larger and more complex sporophyte is more prominent demonstrate increased levels of
organization
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Major evolutionary advances of the vascular plants
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Major evolutionary advances of the vascular plants
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Major evolutionary advances of the vascular plants
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Division Lycophyta: club mosses oldest extant group of vascular plants sporangia organized into strobili (sing.:
strobilus) may be either HOMOSPOROUS or
HETEROSPOROUS Leaves that contained vascular tissue
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REPRESENTATIVE SPECIES
Lycopodium ○ isospores○ bisexual
gametophyte
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REPRESENTATIVE SPECIES
Selaginella small spores (microspores) that germinate
to produce the male gametophytelarger spores (megaspores) that germinate
to produce the female gametophyte
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Division Sphenophyta: scouring rushes
leaves produced at a node (WHORLS) production of isospores spores bearing elaters (devices to aid in
spore dispersal) gametophyte is small, photosynthetic
and free-living Silica concentrated jointed stems
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Division Psilophyta
traditionally considered to be the oldest living lineage of vascular plants
lack roots stem is photosynthetic no leaves but rather minute enations
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sporangia occur in fused groups (synangia)bilobed synangia of Tmesipteristrilobed synangia of Psilotum
resembles what paleobotanists believe Cooksonia
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CHARACTERISTICS:
1. Underground rhizome
2. Unicellular rhizoids
3. Erect stems dichotomize into the main photosynthetic organ
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REPRESENTATIVE species Psilotum (2 species) and Tmesipteris (2-
5 species)
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Division Pteridophyta
reproduce by spores from which the free-living bisexual gametophyte generation develops
megaphyllous leaves leaf is called a frond
fiddleheads
central axis of a compound frond is called the rachis
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ANTHERIDIUM
ARCHAEGONIUM
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READING ASSIGNMENT
READ ON GYMNOSPERMS AND ANGIOSPERMSYou may also use Biology by Campbell and
Reece