PLATE 26 



Ulva angusta S. and G. 

 Fig. 1. A niicro-photograph of a part of the surface. X 442. 



Monostroma areolatum S. and G. 

 Fig. 2. A micro-photograph of a part of the surface. 



Plates 21-2G are from Setehell and Gardner, Phyc. Cont. I, 1920, pp. 279-324, 

 pis. 26-31. 



[360] 



