Marine algae that is referred to as a sea vegetable. It comes in many varieties and is typically salty and rich in flavor. 

Seaweeds can be found in salt or brackish waters all over the world.

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Seaweed contains vitamin E, vitamin C, and carotene. It is also an important source of iodine. 

“The Health Benefits of Seaweed” by Jo Lewin https://www.bbcgoodfood.com/howto/guide/health-benefits-seaweed

New Oxford Book of Food Plants by John Vaughan et al. (2009)