cf. Chara connivens Salzmann ex A. Braun - Convergent Stonewort
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Chara vulgaris L. - Common Stonewort
It could not be Chara connivens which is dioecious, plant from image is monoecious. It's Chara vulgaris from shallow water, noted typical bright, yellow-grey-green colour
Determination author: Łukasz Krajewski