Descriptions of Plants .] APPENDIX. 613 
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. — magnified. 
3. Leaves, magnified. 
4. Male involuerum, containing two flowers, magnified. 
5. — empty. 
(i. Two male flowers. 
7. Amale flower divided longitudinally. 
8. 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 involuerum. 
15. Capsules, with their footstalks arising from the base of the involuerum. 
16. A capsule more highly magnified. 
17. . opened transversely to show the position of the seeds. 
18. empty- 
19. Seeds. 
the end. 
London : Printed by W. Buhner and Co. 
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