CAROTENOIDS 



isoprene residues). It is sufficient here to give its structure which has 

 been elucidated by Karrer and his colleagues : ^ "* * 



HOOC- 



w /w /w /w /w /w /w 



-COOH 



Me Me 



Crocetin 



No confirmation of the striking reports of Kuhn and Moewus '^ '^ * 

 has yet appeared, but it has been reported that Smith ^*>'' is having 

 difficulty in reproducing some of their findings. 



It has recently been claimed that sporogenesis is intimately connected 

 with the extraplastidic carotenoids (occurring in the fat droplets), for 

 " interaction " between sporogenic tissue and these carotenoids has 

 been observed at all stages of growth in a variety of spore-bearing 

 plants. ^°' Just what the " interaction " is, is not at the moment clear. 



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148 



