Spirogyra
Spirogyra is a genus of filamentous green algae of the order Zygnematales, named for the helical or spiral arrangement of the chloroplasts that is diagnostic of the genus. It is commonly found in freshwater areas, and there are more than 400 species of Spirogyra in the world. Spirogyra is very common in relatively clean eutrophic water, developing slimy filamentous green masses. In spring Spirogyra grows under water, but when there is enough sunlight and warmth they produce large amounts of oxygen, adhering as bubbles between the tangled filaments. The filamentous masses come to the surface and become visible as slimy green mats.Spirogyra is a filamentous form.
It has a ribbonlike spiral-shaped chloroplast. The life cycle has haploid adults. Sexual reproduction occurs by conjugation. Conjugation refers to the process where gametes are transferred from one individual to another by a connection between the two. The zygote is resistant and overwinters. In the spring, it divides by meiosis to produce haploid filaments.
It has a ribbonlike spiral-shaped chloroplast. The life cycle has haploid adults. Sexual reproduction occurs by conjugation. Conjugation refers to the process where gametes are transferred from one individual to another by a connection between the two. The zygote is resistant and overwinters. In the spring, it divides by meiosis to produce haploid filaments.