Table 14-1. (Continued) 



' One species studied only— CAara fragilis. 



> Lacking in a few organisms only. 



* The major carotene of most Siphonales. 



' In Siphonales only (as trace). 



" Major carotenoid in one species— the enigmatic Cyanidium caldarium. 



" In the Siphonales only. 



" Four unique xanthophylls claimed. 



One unique xanthophyll claimed to be sometimes present. 



" Two unique xanthophylls claimed. 



Key: + = present; — = absent; ± = irregularly present or absent; + ( — ) = generally present, absent in a 

 few forms; — ( + ) = generally absent, present in a few forms; ?+ = presence doubtful, or insufficiently verified; ? = 

 possibly present in traces. 



275 



