1907.] 



Fresh-water Algal Flora of Ceylon. 



249 



Fig. 5.— Illustration of Colonisation of Submerged Eock-surfaces. A ( x 8|), Single tuft 

 from pilose growth on submerged rocks of a small pond near the tank at Habarane ; 

 growth of Rivularia at base of Hypheothrix. B ( x 13 J), Single tuft from pilose growth 

 on sides of rock-pools, Dambulla. D (X35), the same enlarged. C (x nearly 8), 

 Tuft from pilose growth on submerged rocks in Lake Kantelai ; the dark mass at the 

 base is due to air. Full descriptions of all the figures in the text. 



