Abstract
Bonne Bay, Newfoundland, is the northernmost known location for Callithamnion corymbosum in the western Atlantic Ocean. Growth begins in the late summer and plants may overwinter until the following spring; tetrasporangia are produced in November. In culture the species reproduces by tetraspores that regenerate tetrasporangial plants. Tetrasporogenesis occurs under short daylength and is not inhibited by a light break in the middle of the dark cycle; no spore formation occurs under long days. Cytological examination shows ca. 55–60 chromosomes in parent and offspring plants. Microspectrophotofluorometric measurement of nuclear DNA shows no differences in levels between parent and offspring plants. Key words: Rhodophyceae, Callithamnion, asexual, life history, cytology.
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