Abstract
The taxonomic relationship between the 2 marine blue-green algae,Calothrix scopulorum andC. crustacea, which are considered to be conspecific by some authors, is discussed based on the statistical investigation of morphology with field and culture materials and on the phenological investigation.
The presence or absence of intercalary heterocyst in the filament cannot be always used as a clear taxonomic character to distinguish the 2 species, judging from the result of culture experiment. However, it is confirmed that there are morphological differences between the two in the length of filament, the diameters of filament, trichome, hair, heterocyst and hormogon and the seriation of heterocyst in the filament, and that there are also ecological differences between the two in the color of plant, the tidal level of growth, the period of growth and the season of hormogon formation. From these facts it is concluded thatC. scopulorum andC. crustacea should be treated as separate species.
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Watanabe, M.M., Kurogi, M. Taxonomic reexamination of the two species of blue-green algae,Calothrix scopulorum andC. crustacea . Bot Mag Tokyo 88, 111–125 (1975). https://doi.org/10.1007/BF02491246
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DOI: https://doi.org/10.1007/BF02491246