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Ch.20 Nonvascular plants (Concepts (nonvascular plants (often called…
Ch.20 Nonvascular plants
division bryophyta: mosses
Gametophyte generation
Morphology
gametophytes
leafy stems
mosses
= ubiquitous
in all parts of the world
in almost every environment
water transplant
hydroids
found primarily in Polytrichaceae
conduct water, dissolve minerals
leptoids
species with hydroids usally have letoids
adjacent parenchyma cells, usually cytoplasmic
rhizoids
found at base of stem
small, multicellular trichome structure
don't absorb water or minerals
Sporophyte Generation
Concepts
nonvascular plants
often called bryophytes
have neither vascular tissues nor seeds
vascular cryptograms
have vascular tissue but no seeds
spermatophytes
have vascular and nonvascular
characteristics of nonvascular plants
Mosses
most abundant in cool, moist regions
moss is a gametophyte
liverworts
"Marchantia" most abundant greenhouse
but one of the least typical
is a gametophyte
not a sporophyte
hornworts
are gametophyte
called phaeoceros
division hepatophyta
hepatic gametophytes
thallose liverworts
no confused with mosses
Leafy liverworts
lophocolea: confused with mosses
antheridiophore
male
umbrella shaped outgrowth
archegoniophores
female
apex is like radiating fingers
project outward and down
division hornworts
small, inconspicuous thalloid
grow on moist soil
hidden by grasses and other herbs
