Please enable JavaScript.
Coggle requires JavaScript to display documents.
Seed Plants Without Flowers (Gnetophyta (compound pollen cones (contain…
Seed Plants Without Flowers
Progymnospermophyta: progymnosperms
aneurophytales
primary xylem was a protostele
little webbing between branches
archaeopteridales
planated branch systems, simple leaves
megaspores, no seeds
evolution of seeds
integument
layer of tissue that surrounded megasporangium
micropyle
hole in integument that let sperm cells swim to egg
pollen chamber
place where microspores settled at top of megasporangium
microspores evolved into pollen grains
Pteridospermophyta: seed ferns
Upper Devonian period
longer and wider tracheids
tall large wedges of parenchyma
rays many cells wide
Coniferophyta: Conifers
1-2 long veins running down center of needle shaped leaf, or several parallel veins in scale shaped leaves
transfusion tissue
long and short shoots
no seive tubes
seed and pollen cones on same plant
pollen cones
microsporophylls
simple cones
seed cones
compound cones
cone bracts
megasporophylls
ovuliferous scale
Cycadophyta: cycads
stout trunks, pinnately compound leaves
tracheids long and wide
#
seed and pollen cones on different plant
pollen cones
clusters of microsporangia
seed cones
megasporangium
#
Cycadeoidophyta: cycadeoids
vegetative features nearly identical to cycads
#
Cones
have both microsporophylls and megasporophylls
Ginkgophyta: maidenhair tree
only Ginko biloba
looks like dicot but has wood like conifers
short and long shoots
No cones, ovules are at ends of a short stalk
seeds stink
Gnetophyta
Welsitschia mirabilis, Ephedra, and Gnetum
compound pollen cones
contain small bracts
compound seed cones
extra layers of tissues around ovules
anthophytes
two sister clades with possibility of common ancestor
tracheids are similar
ovules are like seed ferns'
