Pythium porphyrae, is a parasitic species of oomycete in the family Pythiaceae.[5] It is the cause of red rot disease or red wasting disease, also called akagusare (赤ぐされ) in Japanese.[1][6] The specific epithetporphyrae (πορφυρα) stems from the genus of one of its common hosts, Porphyra, and the purple-red color of the lesions on the thallus of the host.[7] However, many of its hosts have been moved from the genus Porphyra to Pyropia.
^ abTakahashi, Minoru; Ichitani, Takio; Sasaki, Minoru (1977). "ノリ赤腐病を起因するPythium porphyrae" [Pythium porphyrae sp. nov. causing red rot of marine algae Porphyra spp.]. Transactions of the Mycological Society of Japan. 18 (3): 279–285.
^Griffith, Chuck (2005). "Dictionary of Botanical Epithets". Dictionary of Botanical Epithets. Retrieved 3 October 2017. purple-red porphyra porphyr noun/f πορφυρα the purple-fish or the dye that was made from it