, '' 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 '' .
The Zygnematales 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 '' .