-rr^r. r^ r.r. . ^r. 700 600 500^/^400 



700 ^00 500JJ.JX400 ^^ 



A B 



Fig. 215 Absorption curves of A, Monostroma B, Delesseria at 

 different depths. (After Seybold.) 



400 440 480 520 560 600 640 680 720 760m|Li 



400 440 480 520 560 600 640 680 720 mjx 



Fig. 2i6 Absorption (a) and action (t) spectra of marine algae. 

 Top: Coilodesme calif ornica (Ca, Ct) and Smithora (Porphyra) 

 naiadum (Na, Nt). Below: Ulva taeniata (a, t). (After Haxo and 



Blinks.) 



399 



