Presentation about Equisetopsida

1. Land Plants
Clubmosses
and friends
Spore-dispersed
Euphyllophytes
Seed Plants
megaphylls

2. Equisetophytes
We will be looking at 2 orders today:
•Equisetales
•Sphenophyllales

3. Equisetophyte features:
•Creeping rhizomes and aerial stems
•Leaves (& branches) in whorls at nodes
•Jointed stems with prominent ridges
•Silica impregnated epidermis
•Sporangia arranged in strobili

4. Equisetales, Equisetum

6. Equisetum strobilus with
whorls of hexagonal
units called
sporangiophores

7. • photosynthetic
• spherical in shape
• with elaters -- ribbon-like
extentions of the spore coat
Equisetum
spores

8. Equisetum gametophytes tend to be
unisexual
Archegonia
Archegoniate
gametophyte
Antheridiate
gametophyte

9. Equisetum stem anatomy

10. Anatomy of the Equisetum
internode

11. An Equisetum vascular bundle

12. Equisetum strobilus anatomy

13. Spores

14. Spores Terminal flange

15. Equisetales: Calamites, a fossil horsetail from the Carboniferous

16. We will look at three form genera in the composite genus, Calamites:
Annularia
Asterophyllites
Calamites

18. Sphenophyllales:
Sphenophyllum