Tags: Green Alga.
The Zygnematales (Greek: ζυγός (zygos) + νήμα (nēma) (nom.) νήματος (nēmatos) (gen.)) also called the Conjugales are an order of green algae comprising several thousand different species in genera such as the well-known Zygnema and Spirogyra. All the members of this group develop into unbranched filaments one cell thick which grow longer through normal cell division.
