Please enable JavaScript.
Coggle requires JavaScript to display documents.
nonvascular plants: mosses, liverworts, and hornworms (characters of…
nonvascular plants: mosses, liverworts, and hornworms
characters of nonvascular plants
embryophyts with no vascular tissue
reproductive cells surrounded by sterile layer
alternation of heteromorphic generations
classification of nonvascular plants
three divisions unknown on ancestry linkage
division bryophyta: mosses
the gametophyte generation
morphology
gametophores
leafy stems
#
grow from apical meristem
prominent apical cell
water transport
hydroids
conduct water
dissolve minerals
leptoids
resemble sieve cells
elongated
prominent interconnections
lack nuclei at maturity
development
spore germination
protonema
network of growth
reproduction
microgametangia
antheridia
short stalk
megagametangia
egg formation
the sporophyte generation
zygote
foot
bulbous tissue
absorbs sugars, minerals, etc
capsule
outer layer
sterile cells
inner layer
sterile cells
seta
narrow stalk
sporophyte
true epidermis
metabolism and ecology
lack of conducting tissue
small size
#
cannot go long without water
not much reserve
found in mostly wet niches
division hetatophyta: liverworsts
the gametophyte generation
leafy liverworst
resembles gametes of moss
three clearly defined rows
thallose liverworst
flat and ribbon like
body without
roots
stems
leaves
large air pores
cannot be closed
umbrella shaped growth
antheridiophore
the sporophyte generation
little varialbilty
do not undergo mitosis
elater differation instead
division anthocerotophyta: Hornworms
the gametophyte generation
always thin
shaped like a ribbon or heart
also irregular and form a disc
numerous chambers
symbios
'Nostoc'
the sporophyte generation
above foot is meristem
continuously produces new sporangium tissue
typically 1 to 2 cm tall
can be up to 12 cm
cannot be grown without gametophyte
