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Palisada flagellifera  (Ceramiales, Rhodophyta) is recorded for the first time in the eastern Atlantic Ocean off Tenerife, La Gomera, La Palma and Fuerteventura, Canary Islands, Spain. The specimens were collected in 2006–2009 growing from the lower intertidal to subtidal zones to 2 m depth at sites exposed to wave action. The species possesses a palisade-like arrangement of cortical cells in cross section, lacks secondary pit connections between them, and has tetrasporangia produced by three fertile pericentral cells (the third and the fourth additional and the second that becomes fertile), and a right-angled arrangement of tetrasporangia. Gametangia were not observed. The phylogenetic relationships were inferred by analyses of the chloroplast-encoded  rbc L gene sequences from 46 taxa. The Canarian and Brazilian  P. flagellifera  specimens formed a highly supported clade with a low level of genetic variation in the  rbc L sequences (0.02–0.04%), confirming that they are the same taxonomic entity. This study expands the geographical distribution of  P .  flagellifera  to the eastern Atlantic Ocean.

botanica marina

Palisada flagellifera  (Ceramiales, Rhodophyta) from the Canary Islands, Spain: a new record for the eastern Atlantic Ocean based on morphological and molecular evidence