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SUMMARY

The photopigments of the Siphonaceous marine alga Codium fragile have been quantitatively determined using thin layer chromatography (TLC). Codium fragile fronds contain a unique spectrum of carotenoids, notable by the absence of β-carotene, and the presence of a- and e-carotenes, siphonoxanthin, siphonein, neoxanthin and violaxanthin. The carotenes are present in low concentrations whereas siphonoxanthin and its ester siphonein account for as much as 60% of the total carotenoids present. The significance of these findings is discussed in relation to the habitat of this alga.