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What are the edible algae in fresh water?
1. Porphyra is a general term for algae that grow alternately in the sea. Porphyra is a kind of marine red algae. The thallus is composed of a layer of cells embedded in a thin layer of colloid, which is dark brown, red or purple. ?

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2. Kelp, alias kelp and Chinese cabbage. A brown algae, which grows on rocks at the bottom of the sea, is banded and contains a lot of iodine, which can be used to extract iodine and potassium. ?

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3. Nostoc flagelliforme, referred to as Nostoc flagelliforme, is a plant of Cyanophyta and Nostoc.

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4. Undaria pinnatifida Undaria pinnatifida is a temperate seaweed, which belongs to brown algae and has pinnate division like Undaria pinnatifida.

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5. Gelidium, also known as frozen vegetables, HongLing, phoenix tail, etc. , is a kind of red algae. It is transparent, like jelly, crisp and tender, and can be mixed with cold dishes to make jelly. Gelidium is also the main raw material for extracting agar.

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6. Chinese cabbage is the algae body of Ulva pertusa, also known as sea spinach, sea lettuce, seaweed and moss vegetables. Algae are turquoise, solitary or clustered, with a height of 10- 14 cm, and often have holes of different sizes.

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7. Sargassum fusiforme, an algae plant, belongs to Sargassum family of Phaeophyta, and its aliases are seaweed, Cephalotaxus fortunei, antler tip, seaweed bud, goat milk and sea barley.

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8. Gracilaria, commonly known as "Gracilaria lemaneiformis" by northern coastal people, belongs to red algae. The algae body is cylindrical and is often used to make agar.

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9. Xuanzao, commonly known as camel hair, belongs to brown algae and has a tubular body, which is often used to pinch alginate and mannitol.

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