A cytological study of varietal forms in Polysiphonia harveyi and P. ferulacea (Rhodophyta, Ceramiales)

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Abstract
Previous taxonomic and ecological investigations of the genus Polysiphonia in North Carolina demonstrated the presence of two morphological forms of P. harveyi: var. arietina (Bailey) Harvey and var. olneyi (Harvey) Collins as well as two reproductively isolated populations of P. ferulacea. A cytological investigation of these two species revealed the presence of thirty-two bivalents (n= 32) for P. harveyi var. arietina, and twenty-eight bivalents (n=28) for var. olneyi, and twenty-seven bivalents (n=27) for populations of P. ferulacea reproducing without asexual propagules. These results are explained in terms of the respective taxonomic species consisting of genetically related but reproductively isolated aneuploid sibling species.

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