Fine structure and pigments of Oscillatoria (Trichodesmium) aff. thiebautii (Cyanophyta) in culture

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Abstract
Filaments provisionally identified as Oscillatoria (Trichodesmium)thiebautii (Gomont ex Gomont) Geitler, from a marine coast at Qingdao, China, were isolated and grown in laboratory culture. Thin sections were examined by transmission electron microscopy, and details of the cell wall layers, radially arranged thylakoids, gas vacuoles, lipid droplets, etc., are described. Preliminary spectral characterizations of the chromatographically separated pigments indicate the presence of an anomalous phycoerythrin (.times.max = 542 and 563 nm) lacking the prominent 495 nm absorbance peak found in previously examined phycoerythrins from a marine planktonic Oscillatoria. The major fat-soluble pigments are similar to those of other phycoerythrin-rich cyanophytes. For comparison we present also some original data obtained from pigment analyses of similar material collected from a bloom that occurred off the coast of Queensland, Australia, in 1966.