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Chapter 20: Nonvascular Plants (Division Anthocerotophyta: Hornworts…
Chapter 20: Nonvascular Plants
Division Bryophta: Mosses
The Gametophyte Generation
Morphology
gametophores
leafy stems
grow close together
from apical meristem
Development
network is called
protonema
growth begins
sperm germinates
send out chorophyllous cell
cell undergoes mitosis
produces cells
Reproduction
antheridia
microgametangia
sperms produced in
archegonia
megametangia
eggs occur in
mosses are oogamous
small, biflagellate cells
nonmotile egg cells
Water Transport
hydroids
innermost cortex
conduct water
dissolved minerals
leptoids
resemble sieve cells
elongated
lack nuclei @ maturity
rhizoids
small
multicelular-trichome like
anchor the stem
mosses lack hydroids/leptoids
ubiquitious
Division Hepatophyta: Liveworts
small plants
The Gametophyte Generation
2 basic groups
thallose liverworts
leafy liveworts
gametophore resembles moss
thallus
the body
without roots
without stems
without leaves
air pores
Division Anthocerotophyta: Hornworts
group of small thalloid plants
grow on moist soil
Gametophyte Generation
multicellular form of a plant
forms gametes through mitosis
Archegonia
formed from superficial cells
haploid
Sporophyte Generation
diploid
forms haploid spores
Concepts
plants divison
3 ways
nonvascular plants
no vascular tissue
no seeds
vascular cryptogams
vascular tissue
no seeds
spermatophytes
both vascular tissue & seeds
nonvascular plants arose first
