LONGTIN, Caroline M., & Gary W. SAUNDERS 2015 (Sep. 1) On the utility of mucilage ducts as a taxonomic character in Laminaria and Saccharina (Phaeophyceae) — the conundrum of S. groenlandica Phycologia 54(5): 440-450, 28 figs., 1 table Saccharina nigripes n.c.