514 



MARSILEACE/E. 



sac continues the same, vessels in both extending into the ba3e of the 

 pistil. There is some difference as regards the yellow sac, which 

 in the left hand one is twice as big as in the other, and crowned 

 with brown grume. In the right, the grume appears in massules, 

 prior to condensation ? In both, there are cells projecting about the 

 base of the original sac between it and the walls of the pistil cavity. 



The small yellow sac alone is separable, as also the grume; with 

 a tendency to lobing, so that it is the most advanced. 



Azolla, PJ. CXXII. {continued.) 



Fig. I. — 1. Circumscissed seeds or bodies of Azolla pinnata. 



2. Contents separated with the apex of the seed. 



3. Apex of the seed, (analogy to Lemna.) 



4. Same as 2, circumscissed apex of seed removed. 



5. Same, the frondose lobes slightly separated. 



6. Lower brown free end of the same, shews the upper surface of 

 the yellow sac. 



7. Another view of the same as an opaque object, the trifacial 

 lines distinctly seen. 



8. Part of the crustaceous coat \ M. 



9. Yellow sac burst, to shew its contents. 



10. Do. entire. 



11. Frondose lobe. 



12. One of the fibies, 1-16. 



Fig. II — Two pistilla dissimilar producing. 



In both, the apex is distinctly umbilicate, and browned, with 

 something like traces of confervoid filaments on the larger, but 

 uncertain. Then the granular origin of the funnel-shaped mass, 

 is distinct in both, but in larger only presenting in the centre 

 the communicating line. In the smaller, the original sac is not 

 enlarged, it is distant from the granular funnel, which is trun- 

 cate, and also from the sides of the cavity, between which and the 

 sac, as well as all round its base, are many cellular bodies, these af- 

 terwards are the pedicellate 3, 4, ternary bodies. 



In the larger, the sac is much enlarged, occupying the whole cavi- 

 ty, except round its immediate base, where one or two cellular minute 

 projections occur, touching the granular funnel. This body contains a 



