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Nonvascular plants (characteristics (bodies composed of true parenchyma…
Nonvascular plants
characteristics
leafy stems
almost exclusively terrestrial
bodies composed of true parenchyma
derived by three-dimensional growth
have a cuticle over much of their bodies
multicellular sporangia and gametangia
reproductive cells are always covered by one or several layers of sterile cells
many have stomata
emryophytes
do not have vascular tissue
division bryophyta: mosses
the gametophyte generation
water transport
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leptoids
typically in species that also have hydroids
cells that resemble sieve cells
hydroids
elongated cells that loose their cytoplasm when mature
conduct water and dissolve minerals
development
growth of gametophore
begins when a spore germinates and sends out a long slender chlorophyllous cell
this cell undergoes mitosis and produces a branched system of similar cells
this entire network is called a protonema
morphology
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species in particularly wet areas are more open and loose
Scouleria
gametophores grow as ribbon up to 15 cm long submerged in rapidly flowing water
many mosses grow in tightly pressed dense mounds
all mosses have stem leaves
gametophores
grow from apical meristem
reproduction
all mosses are oogamous
every species has a biflagellate sperm cells and large non motile egg cells
antherida
where sperm is produced
short stalk outermost layer of sterile cells
archegonia
where eggs are located
each is shaped like a vase with a long neckl
the sporophyte generation
operculum
[peristome teeth
capsule
calyptra
foot
metabolism and ecology
division anthocerotophyta: hornworts
the gametophyte generation
the sporophyte generation
division hepatophyta: liverworts
the gametophyte generation
the sporophyte generation
classification
often 3 distict divisions:
mosses
bryophyta
hornworts
anthocerotophyta
liverworts
hepatophyta