148 Puget Sound Marine Sta. Pub. Vol. 1, No. 13 



PLATE 25 



Fig. 1. Alaria costata with thin portion of blade cut off leaving only 

 midrib; marked into 5 cm. spaces. 



Fig. 2. Same plant as figure 1 after 41 days, showing the distribu- 

 tion of growth. 



Fig. 3. Diagram of basal 10 cm. of blade of young Laminaria sac- 

 charine. 



Fig. 4. Diagram of the same blade as figures 3, after 30 days, 

 showing the distribution of growth. 



Fig. 5. Diagram of the basal 10 cm. of young blade of an Alaria 

 costata. 



Fig. 6. Diagram of the same blade as figure 5, after 30 days, show- 

 ing the distribution of growth. 



