Ключевые слова: aquatic, aquatic ferns, aquatic plant, archegonia, azolla, azolla pinnata, background, beautiful, bio fertilizer, botanical, botany, closeup, detail, duckweed fern, environment, fairy moss, fern, fertilizer, filiculoides, floating, foliage, fresh, gametophyte, green, growth, hydrophyte, leaf, macro, microsporangium, microspores, mosquito, mosquito fern, natural, nitrogen, nitrogen cycle, nitrogen fertilizer, nitrogen fixation, organic, pattern, plant, salviniaceae, small, spore, sporocarps, surface, texture, tropical, water fern, water velvet, weed,