ARAGONITE IN HALIMED A AND TYDEMANIA (ORDER SIPHON ALES)12

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Abstract
The mineral component of the marine green algal genus Halimeda is the orthorhombic calcium carbonate (aragonite); its presence appears to be a generic characteristic. Tydemania expeditionis also precipitates aragonite in contradistinction to species of the red alga Corallina which precipitate calcium carbonate of the hexagonal form (calcite). The analyses are based on X-ray diffraction methods. Although other inorganic substances are present, the amounts are minor and probably represent contaminants. Specimens that are to be studied for mineral components should not be stored in formalin.

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