bodies of the upper cell being only six in number, there can remain little doubt of its being really the male organ.
The genus Azolla was founded by Lamarck on specimens of the South American species entirely destitute of fructification, the remains of which only appear to have been seen more recently by Willdenow, who describes it as a "Capsula unilocularis polysperma."
REFERENCES TO TAB. 10.
Azolla pinnata.
1. Plant of the natural size.
2. Plant— — — magnified.
3. Leaves, magnified.
4. Male involucrum, containing two flowers, magnified.
5. Male involucrum,— — — empty.
6. Two male flowers.
7. A male flower divided longitudinally.
8. A male flower— — — deprived of its Calyptra, 9.
10. Lower cell of a male flower.
11 and 12. Different views of the contents of the upper cell.
13. Longitudinal section of the upper cell.
14. Inner female involucrum.
15. Capsules, with their footstalks arising from the base of the involucrum.
16. A capsule more highly magnified.
17. A capsule— — — opened transversely to show the position of the seeds.
18. A capsule opened transversely— — — empty.
19. Seeds.
THE END.
London: Printed by W. Bulmer and Co.
Cleveland-row, St. James's.
