Abstract
ABSTRACTThe life history of Callithamnion byssoides Arnott ex Harv. in Hook. from North Carolina is shown to be of the Polysiphonia‐type. Cross‐gradient light‐temperature culture in 8:16 and 14:10 LD cycles was utilized to investigate the effects of light intensity, temperature and day‐length on growth and reproduction. Carposporophyte and tetrasporangium development were controlled by total light energy rather than photoperiod. Results of these studies explain the observed seasonal periodicity of growth and reproduction on the North Carolina coast. Variations between these results and previously published data for this species in Texas are explained in terms of ecotypic differentiation.
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