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Molecular studies were carried out on  Chondrophycus gemmiferus  and  C. poiteaui  (Rhodomelaceae) from the Mexican Caribbean Sea. These species are morphologically related, but differ mainly in the presence of the apiculate projection of epidermal cells near the apices of branches. Both species belong to  Chondrophycus,  as indicated by the presence of two periaxial cells per axial segment and a 90° arrangement of tetrasporangia, but share characteristics with  Laurencia  species (e.g., presence of secondary pit connections between adjacent epidermal cells). The phylogenetic position of these species was inferred by an analysis of chloroplast-encoded  rbc L gene sequences of 21 taxa, using two members of the Rhodomelaceae and two of the Ceramiaceae as outgroups. The results corroborate the taxonomy of the  Laurencia  complex, which comprises the genera  Laurencia, Chondrophycus  and  Osmundea , and indicate that  rbc L provides an adequate phylogenetic signal to study the intergeneric and interspecific relationships within the complex. In spite of this, relationships within the clade formed by  C. gemmiferus  and  C. poiteaui  were not resolved by any analysis because of the low level of genetic variation between their  rbc L sequences (0.01–0.02%). On the basis of both molecular data and morphological similarities, we concluded that  C. gemmiferus  should be considered as a variety of  C. poiteaui  and the following new combination is proposed:  Chondrophycus poiteaui  var.  gemmiferus  (Harvey) comb . et  stat. nov.

botanica marina

Molecular evidence for  Chondrophycus poiteaui  var.  gemmiferus  comb . et  stat. nov. (Ceramiales, Rhodophyta) from the Mexican Caribbean Sea: implications for the taxonomy of the  Laurencia  complex