Porphyra umbilicalis f. purpurea (Roth) Jadin
(Please note: only references with the binomials in the title are included. The information is from the Literature database.)
Kraemer, G.P. & Yarish, C. (1999). A preliminary comparison of the mariculture potential of Porphyra purpurea and Porphyra umbilicalis. Journal of Applied Phycology 11: 473-477.