AZOLLA. 



513 



the apex brown : umbilicus distinct, and in the smaller or narrower, 

 an evident line of communication with the apex of funnel. This in 

 both appeared crammed with granules of a brownish red, its upper 

 end most distinctly defined in the narrower pistil. 



In the nucleus is a diffused grumous disk. Dark aerating ? lines 

 from base of the pistil, extending irregularly upwards, male??; the 

 cells have granular fovillar contents, especially the terminal one. 



Confervoid filaments not passing into the umbilicus, but adhering 

 to the apex apparently. Apex of larger with none. 



The structure of the apex appears to be composed of four sets of 

 cells, so perhaps herein there is something like Chara. 



Acid causes grumous nuclei in each cell of the surface, and the 

 disappearance of the funnel. Pressure after it shews the bag, as 

 if it were extending to the base of the pistil. 



In the drawing, the centre is seen through the surface, so that the 

 surface cells are not represented. Measured \ Achromatic. 



Fig. V. — These two are scarcely distinguishable at first sight, 

 but in the upper one the sac is larger, the grumous nucleus and its 

 transparent part both more developed ; after maceration in water it 

 assumes more of its mature form, i. e. the grumous nucleus appears 

 erect, as if incasing a transparent bag. 



In the smaller, the grumous nucleus is smaller, less distinct, and so 

 is the transparent part, which disappears after maceration in water. 



The upper one would afterwards have the yellow sac, and its 

 frondose stuff at top. In both, vessels are plain enough; 



In the smaller or under, small cells exist round the base of the nu- 

 cleus, or origin of the sac. 



Confervoid filaments outside, adhering to the upper pistil, and 

 antheriform bodies at the base. 



Fig. VI. — A pair of ovula, £ M. 



The lowest will be the frondiferous, the uppermost sporuligerous. 



In the former the developement of new parts takes place within 

 the nucleus, in the other without. 



Confervoid filaments only to the upper one, the development of 

 the angular granules of the lower appears coevul with that of the 

 yellow sac. 



Fig. VII. — Similar, no confervoid filaments observed at the apex, 

 although the granular communication exists, the size of the original 



3 s 



