270 On Azolla and Salvinia. 



9. 10. Ditto ditto in connection with curious, jointed, often 

 very irregular bodies, the history of which was not 

 traced. 



11. Young secondary capsule more advanced : burst by 



pressure. Young trifacial cells shewn in the escap- 

 ed grume. 



12. One of these trifacial cells, about 500 times. 



13. Portion of the contents of one of these secondary cap- 



sules, shewing the parent cells, and enclosed (trifacial 

 cells) or spores : only observed once ; 300 times. 



14. Young secondary capsule, for the most part filled with 



grume and (yellow) trifacial cells. 



15. Ditto more advanced : the primary masses are being 



developed. 



16. Trifacial cells (spores) detached from the same. 



17. 18. Fully developed secondary capsule : containing 3 masses 

 in which the spores are imbedded. 



19. Secondary capsules, surface view. 



20. Masses of the same. 



21. A mass detached, 

 f 22. Portion of a plant, (natural size.) 



23. The same magnified. 



24. Contents of the calyptrate capsule, calyptra removed. 



25. Longitudinal section of body crowning the (yellow) 

 sac, (upper loculus of Brown.) 



26. One of the other kind of secondary capsules, cut across. 



27. One of the masses of the same under two aspects. 



SALVINIA VERTICILLATA. 



PI. xviii. 



(Development of the Organs, (Ovula,) and of the indefinite mass-containing 

 secondary capsules and their contents, trifacial cells (or spores.) 



Fig. 1. Apex of a reproductive-organ-bearing axis with one 

 somewhat developed ovulum, and one in a much 

 earlier state, i. e. before the appearance even of the 

 tegument. Both, from their situation, would have 

 contained the spherical mass-containing secondary 

 capsules. 



2. A young organ (ovulum) under pressure, it is the small 



one of No. 4. 



3. Another rather more advanced. 



From Fd. 

 Bauer. 



