Abstract
Abstract Experimental culture of Ceramium rubrum (Huds.) C. Ag. and C. rubriforme Kylin from Nova Scotia showed considerable phenotypic variation that was primarily a response to the environmental factors of daylength and temperature. Completely corticated plants, similar to C. rubrum, resulted from all isolates grown under short daylengths (8, 10 and 12 hr). Plants with long, bare internodes and distinct cortical bands developed under long daylengths (16 and 24 hr). As cortical cells proliferated, these plants developed cortical bands similar to those described for C. rubriforme and C. areschougii Kylin. These results suggest that a number of taxonomic characters used to delimit species of Ceramium are not reliable, and that C. rubriforme, C. areschougii and C. pedicellatum DC (= C. rubrum var pedicellatum Duby) in the northwestern Atlantic probably are synonymous with C. rubrum.
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