454 



Fresh- Water Algce of Canada. 



or a conceptable for seed, we cannot discover ; but the latter is 

 probably the case. 



The fibrillse of the internodes are branched in the same manner 

 as the filaments of the whorls, only the cells are less moniliform and 



AMV* / 





Fig. 3. B. moniliforme. Filament of a Whorl, highly magnified. 



more delicate. The branches are besides not quite so proliferous 

 as in the other, and they spring from the cells which form the 

 outer membrane of the stem (fig. 2). The stem is thickly beset with 

 them, and has mueh the appearance of a Tkorea. This is the 

 characteristic feature of this plant. It is evidently, too, much 

 more proliferous in the filaments of its whorls (fig. 3) than any we 

 have yet seen. This, however, may be only an effect of climate or 

 situation, and need not be considered as a distinct or specific 

 character. The stems of this plant are cylinders, the walls of 

 which are composed ©f many small, articulated, tubular^ fila- 

 ments, united together by a mucous integument. They swell out 

 slightly at the articulations of the stem, from which the whorls 

 spring, as may be seen in Fig. 2, and have much the appearance 

 of a bamboo. 



Some species of this genus are regarded as the most hardy of the 



