5J6 



MARSILEACE.E. 



and quaternary division takes place. The right hand one is rather 

 more advanced than the other J. 



Azolla, PI. CXXIII. {continued.) 



Fig. I. — 1. Azolla pinnata, portion, of the plant magnified. 



2. Root, the apex enclosed in its sheaths. 



3. Ditto the sheaths removed. 



4. Transverse section of the root. 



5. Apex of the root as it appears enclosed in its sheath. 



6. Outer sheath* 



7. Inner do. open at the end. 



Azolla, PI. CXXVII. {continued.) 



Fig. I.—l. Very young capsule, a mere cellar body, of two cells, 

 the terminal one with a nucleus of grume. 



2. More advanced, the cells increased, terminal, itself cellular (see 

 margins) contains a cavity in which is grume— nucleus. 



Set. More advanced iodined. 



3. More advanced, grumous mass of considerable size, superficial 

 granules now commencing. 



4. More advanced burst by pressure, contents partly escaped as 

 4a, 46. one of the young spores. 1-16. 



5. More advanced. Iodined, nucleus grume contracted, exhibits 

 yellow sacs. 



C. About the same period — probably would have been abortive. 



7. Capsule now contains several bags, membrane not definable, of 

 these the central one is in focus, and contains several yellow 

 sacs. 



8. Yellow sacs separated, 1-16. — evidently the mature sporal form. 

 See Isoetes etc. 



9. Now the capsule only contains three of the same indefinable 

 membranous sacs, yellow sacs often in 3 and 4 and 2. 



10. More advanced, the three bags are now cellular, solid though 

 not so firm as they afterwards become, the yellow sacs are im- 

 bedded in the cellular mass. 



11. One of the bodies in a mature capsule, the yellow sacs group- 

 ed in 4, at least those that are visible, they contain granules 



