Brown : Algal periodicity 



235 



Oedogoniiun crassiusculum was abundant and the dominant alga 

 in pond no. I, September 20 (figure 3 — chart, pond no. 1.) It was 

 mostly attached to dead Typha stems and other stems under water. 





A few filaments were fruiting. It became more abundant during 

 October, continuing to fruit to some extent. In November it be- 



