“…Several attempts had been made to identi~ the chloroplast pigments of the Xanthophyceae (Kuhn & Brockman, 1932;~arter, Heilbron & Lythgoe, 1939;Seybold, Egle & Hiilsbruch, 1941 ;Heilbron, 1942;Strain, Manning & Hardin, 1944;Jamikorn, 1954;Strain, 1958;gestfik, 1963;Allen et al, 1964;Thomas & Goodwin, 1965;Chapman & Haxo, 1966) before Kleinig & Egger (1967) reported that Vaucheria and Botrydium contained p-carotene, chlorophyll a, antheraxanthin, three tri-esters of the previously undescribed xanthophyll vaucheriaxanthin, an unknown pigment which was subsequently identified by Falk & Kleinig (1968) as trollixanthin, and traces of cryptoxanthin epoxide and zeaxanthin, the latter pigment being produced by a light-induced conversion of antheraxanthin (Kleinig, 1967). Subsequent studies largely fall into two groups, those primarily dealing with the correct identification of the pigments (Falk & Kleinig, 1968;Egger, Nitsche & Kleinig, 1969;Strain et al, 1968Strain et al, , 1970Stransky & Hager, 1970a) and those primarily concerned with recognition of the fact that some of the unicellular forms belong to a separate taxonomic group (Whittle & Casselton, 1969, 1975Guillard & Lorenzen, 1972) corresponding to the Eustigmatophyceae of Hibberd & Leedale (1970, 1971b, 1972. Falk & Kleinig (1968) claimed that Tribonema had the same pigments as Vaucheria and Botrydium, except that the minor xanthophyll cryptoxanthin was missing.…”