Brown : Algal periodicity 



229 



ceased and the plant multiplied rapidly vegetatively until the water 

 began to get low again. This species appeared in stream no. I above 

 the campus during October (figure 2 — chart, stream no. i), but 





was never very abundant. Some was noticed forming spores on 

 November 1 5. Spores were formed in cells of the filament without 



