Cycadales and Ginkgo

1

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

Tissue types, arrangement? Life
cycle? Synapomorphies?
2

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

• Rosette growth habit
• Secondary growth?
• Girdling leaf traces
• Coralloid roots
• Eusteles!

3

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

• Rosette growth habit
• Secondary growth?
• Girdling leaf traces
• Coralloid roots
• Eusteles!

4

• Cycadales and Ginko
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

5

• Cycadales and Ginko
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

6
(No Transcript)
7

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

• Microsporophyll
• Eu- or Leptosporangia?

8

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

• Salpinx?
• Megasporophyll
• How does the sperm get to the egg?

C
M
9

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

• Female Gametophyte
• Nucellus
• Integument
• Endotesta
• Scelerotesta
• Sarcotesta

10

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

C
M
11

• Cycadales and Ginkgo
• Cycadales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Cones
• Female, male gametophytes
• Embryo development

12

• Cycadales and Ginkgo
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

- Leaf Characters? - Short vs. Long shoots
13

• Cycadales and Ginkgo
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

Crystals!
Shoot Apical Meristem
14

• Cycadales and Ginkgo
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

lt Root cross section
15

• Cycadales and Ginkgo
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

16

• Cycadales and Ginkgo
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

17

• Cycadales and Ginkgo
• Ginkgoales
• Vegetative
• Leaves, stems, roots
• Reproductive
• Female, male gametophytes
• Embryo development

What happens to the cotyledons during germination?