Thus, nori came to be rooted in Japanese food culture and nori with the specific names, such as 'ama nori (sweet nori)' or 'murasaki nori (purple nori),' appeared in "Utsuho-monogatari (Utsuho Story)" which was written in or around 987.
こうして海苔は日本の食文化に定着し、987年頃に書かれた『宇津保物語』には、甘海苔や紫海苔といった具体的な名称で海苔が登場している。