416 



THE PIGMENT SYSTEM 



Table 15.V 

 Carotenoids of the Algae 



CHAP. 15 



' Fucoxanthol occurs in several isomeric forms; cf., for example, Strain and Manning (1942). 

 * Only in a few species. 



encountered in other plants. Strain and Manning (1943) found in the 

 diatom Navicula torquatum, a new carotene, whose spectrum was similar 

 to that of violaxanthol.* 



Table 15.VI 

 Carotenols of Brown Algae 



Quantitative data are available only for brown algae. Table 15.VI 

 contains figures given by Willstatter and Page (1914) and Seybold and 

 Egle (1938). 



In purple bacteria, bacteriochlorophyll is accompanied by several 

 carotenoids different from those of the higher plants. Karrer and 

 Solmssen (1935, 1936) have identified in the Rhodovibrio two hydro- 

 carbons (flavorhodin and rhodopurpurin) and three oxygen-containing 

 carotenoids — rhodoviolascin, rhodopol and rhodovibrin (cf. p. 473). 



* New results of these authors (1944) will be described in Vol. II, Chap. 21. 



