Seaweed is a kind of nori.
Purple seaweed is not just a species, but a collective name for hundreds of species in the red algae family Rubiaceae, and the vast majority of the kind of dark green, thin and crunchy seaweed sold on the domestic market is processed striped purslane. So we can say that the seaweed we buy in China is a kind of seaweed, but not all seaweed is processed into seaweed.
Expanded Information:
The origin of the word:
Word Origin:Seaweed, a word from Japan; in Japanese, "seaweed" is written "seaweed", hiragana: のり, katakana: ノ リ, Roman: no ri.
In the old Japanese language refers to "algae", now refers to the "striped nori". You won't find the word seaweed in the Chinese dictionary.
The correct understanding of the word seaweed is to be found in a Japanese dictionary.
No [seaweed]
1, nori: altar nori, spotted nori, and kanji nori are the main cultured varieties, and have very high nutritional value.
2. Seaweed: a general term for edible algae.
Baidu Encyclopedia-Seaweed