1. (Horsetail; Scouring Rush)
Equisetum
(Horsetail; Scouring Rush) 2

2. Fun Facts 12 1
Uptake Silica 13 11 10

3. Evolutionary Significance15 14
Close relatives (Equisetum itself?) present in the Carboniferous (
(Carboniferous: MYA)

4. Life Cycle 6 5

5. Sporophyte: Stem and Leaves

6. Sporophyte: Photosynthesis

7. Leaves, Bud Primordia, Root Primordia
Fig in Foster and Gifford 1989

8. Sporophyte: Shoot Growth Form
Equisetum hyemale, E. pratense and E. sylvaticum

9. Sporophyte: Primary Growth

10. Sporophyte: Intercalary Growth
Meristem
Intercalary
Meristem

11. Stem Anatomy

12. Sporophyte: Stem Anatomy
(Collenchyma)

13. Sporophyte: Stem Anatomy
(Canals)
Vallecular Canal
Carinal Canal
Pith Canal

14. Sporophyte: Stem Anatomy (Carinal Canals (= Vascular Canals))
Xylem
Phloem 21
Parenchyma

15. Sporophyte: Stem Anatomy
(Endodermis)
Figs. 10-8, 10-9 in Gifford and Foster 1989

16. Sporophyte: Stem Anatomy
(Vasculature)

17. (Primary Root, Root Primordia)
Sporophyte: Root
(Primary Root, Root Primordia)

18. Sporophyte: Strobilus Position

19. Sporophyte: Strobilus

20. Sporophyte: Sporangium and Tapetum9

21. Sporophyte: Spores, Elaters22

22. 6

23. Gametophyte Sexuality
Fig in Gifford and Foster 1989

24. Gametangia

25. Equisetum: Embryo Development26

26. Embryo Development

27. 29 27 28 5

28. 1 http://www.smianalytical.com/img/silica-dust.jpg2 3 4
arvense-1.jpg 5
%20strobilus.jpg 6 7
Plants/Cryptogamia/Bryophyta/NonvascularPlants/equ_sp_cu.jpg 8 9
_strobilus_xs_of_wm_showing_sporangiophores.jpg/655px-Equisetum_
strobilus_xs_of_wm_showing_sporangiophores.jpg

29. 10 http://www.tradenote.net/images/users/000/099/079/products_images/Silica_Fume_
SiO2.jpg 11 12 13 14
600.jpg 15 16 17
sph_equ_stm.jpg 18
_equ_stm.jpg 19

30. 20 http://science.exeter.edu/jekstrom/JPEG/Eq_vas~1.jpe21 22
Equisetum/Equisetum_spores_MC.jpg 23
_strobilus_wm.jpg/800px-Equisetum_strobilus_wm.jpg 24
strobilus_wm.jpg/800px-Equisetum_strobilus_wm.jpg 25
Endodermis.jpg 26 27 28
web/266.jpg 29
x1.gif