THE CAROTENOIDS 



413 



However, individual variations in this ratio are wider than those in the 

 [a]:[b] ratio. In 24 alpine plants investigated by Seybold and Egle 

 (1939), the [x]:[c] varied between 2 and 15. Even wider variations 

 have been observed in algae. Table 15. Ill shows, for example, a ratio 

 of 20 for Laminaria. Seybold, Egle, and Hulsbruch (1941) found 



Table 15.III 

 Carotenoids in Plants 



B. ALGAE 



Green algae 

 (Chlorophyceae) 

 Ulva lactuca 



Chaetomorpha 

 melagonium 



Chlorella pyrenoidosa 

 Brown algae 

 (Phaeophyceae) 



Fucus serratus 



Laminaria 



Didyota dichotoma 

 Red algae 

 (Rhodophyceae) 



Porphyra laciniata 



« W.S. = Willstatter and Stoll; S.E. = Seybold and Egle; H. = Haskin. 

 i> Including fucoxanthol. 

 ' Including phyllorhodin. 



