A Reinvestigation by Light and Electron Microscopy ofRuttnera SpectabilisGeitler (Haptophyceae), with Special Reference to the Fine Structure of the Zoids

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Abstract
Within the Chromophyta (sensuChristensen, 1962) a number of genera having benthic phases in which the vegetative cells are embedded in masses of thick, sometimes stratified mucilage, have been described from both marine and freshwater habitats. Examples includeGloeochrysisPasch. (Pascher, 1925),GeochrysisPasch. (Pascher, 1931),SarcinochrysisGeitl. (Geitler, 1930),ChrysotilaAnand (Anand, 1937) andRuttneraGeitl. (Geitler, 1942). In many cases the vegetative stages are so similar morphologically as to be almost indistinguishable, especially in the juvenile condition in which the cells are often arranged in regular blocks (the ‘Sarcinochrysis’ condition) and under such circumstances it is difficult to ascertain their true systematic relationships.

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