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Science 11 February 1972:
Vol. 175. no. 4022, pp. 624 - 626
DOI: 10.1126/science.175.4022.624
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Articles

Aragonite Crystals within Codiacean Algae: Distinctive Morphology and Sedimentary Implications

Ronald D. Perkins 1, Michael D. McKenzie 2, and Patricia Lurie Blackwelder 3

1 Department of Geology, Duke University, Durham, North Carolina 27708
2 Department of Botany
3 Department of Zoology

Morphologic studies of single crystals of aragonite within Codiacean algae reveal characteristic crystal forms produced by two distinctly different modes of calcification. Diagnostic serrated crystals (1 micrometer in length) of aragonite originating within the extracellular sheaths of capitular filaments are incorporated into modern lime sediments and may serve as effective tracers for particles of algal origin. Intracellular calcification within Penicillus dumetosus, previously unueported, is represented by doubly terminated aragonite crystals ranging in size from 48 to 160 micrometers.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Calcium Oxalate Crystals in the Aragonite-Producing Green Alga Penicillus and Related Genera.
E. I. Friedmann, E. I. Friedmann, W. C. Roth, J. B. Turner, and R. S. McEwen (1972)
Science 177, 891-893
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Science. ISSN 0036-8075 (print), 1095-9203 (online)