Meristotheca papulosa

Meristotheca papulosa (synonyms: M. japonica and Eucheuma papulosa) is a red alga, popular as a sea vegetable in Taiwan, where it is known as jiguancai (Chinese: 鸡冠菜; pinyin: jīguāncài, literally 'cockscomb vegetable'), and in Japan, where it is known as tosaka-nori (Japanese: トサカノリ).