Morphology-habitat associations in blue-green algae

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Abstract
Morphological and habitat features have been recorded on punchcards for three genera in the Oscillatoriaceae and two in the Nostocaceae. As a result it is concluded that generic divisions in the Oscillatoriaceae are arbitrary and artificial, but that in the Nostocaceae, Cylindrospermum represents a grouping of distinct forms to a greater degree than does the amorphous genus Anabaena. Some morphological comparisons between the two groups are attempted and detectable associations between morphological and habitat features are suggested : together these may contribute to an eventual separation of taxa on a more logical basis than at present.

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