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chapter 22, microsporophyll, microsporangia, giant redwoods, ovules,…
chapter 22
division coniferophyta
50 genera
550 species
moderate to gigantic
giant redwoods
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california
Sequoiadendron giganteum
90 m in height
10 m in diameter
never have
vines
herbs
annuals
bulbs
rhizosomes
perennial
pine
european larch
western juniper
leaves
fir
scale-like
pine
vascular bundle
douglas fir
endodermis
xylem
phloem
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Division Cycadophyta
stout trunks
pinnately compound leaves
1 or 2 m tall
Macrozamia
18 m
big trachieds
massive rays
Dioon
stout trunk
leathery
compound leaves
seed cone
leaf veins
similar to conifer
tranfusion trachieds
from veins
into leaf blade
stomata
small amount of wood
parenchymatous
phloem
Microsporophylls
microsporangia
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Division Ginkgophyta
single living species
“maidenhair tree”
looks like dicot
conifer like wood
lacks
vessels
axial parenchyma
“broad leaves”
branched veins
reproduction
gingko
dioecious
gymnospermous
no cones
pollen
prod in organ
ovules pair
megasporophyll
no protection
integument exposed
sporangiophores
two microsporangia
Ginkgo biloba
mistaken for dicot
broad
dichotomous venation
not reticulate venation
Microsporophylls
#
cone-like clusters
mixed w foliage
concepts
life cycle
vascular cryptogams
independent
heteromorphic generations
new sporophyte
from zygote
temporarily dependent
tiny gametophyte
evolution of seeds
vascular cambium preceded
produce massive trees
giant redwoods
oaks
hickories
lignophytes
monophyletic group
woody plants
spermatophytes
seed plants
Spermatophyta
Gymnospermae
naked ovules
#
flat sporophylls
pine cones
Angiospermae
flowering plants
mature carpels
tube sporophylls
vascular cambium
Progymnosperms
microsporophyll
microsporangia
giant redwoods
ovules
phloem
