What's this green crispy vegetable or edible seaweed?

Question

My grandparents saw, but didn't take, these online images at Chiu Chow Garden restauarant in Central, Hong Kong. They can't remember which website: perhaps OpenRice? What's the scientific name for the green?

Sources: Left, Right picture.

Answer 1

Looks like qúndài cài (裙带菜)/Wakame/sea mustard.