LE3SOX 68.] 



MUSCULAR FIBRE. 



229 



1017. The series of large, dark, circular masses (a) around the figure, 

 and near the margin, are the sporangia (spora, a seed ; aggos, a vessel ; 

 spore, that portion of a plant which performs the function of seeds). 



FIG. 355. 



Fresh-water Alga, parasitic on pond Lilies. 



1018. In this order of plants propagation is effected by the spon- 

 taneous division of cells, and by spores, contained in what is called 

 " mother-cells " (perispores), the structures described (a) in the figure. 



FIG. 857. 



FIG. 856. 



Callithalnaia Baileii. 



Alga, from Barbadoes. 



1019. In a beautiful Marine Alga, Callithalmia Baileii, its 

 specific name, in honor of the late Professor Bailey, of West Point, 



