Question

Thallus structure of zygnema

Answer 1

The zygnema is a filamentous algae floating on surface of water. The filament in the zygnema is unbranched and the cells are joined end to end. Each cell are rectangular in shape which has the outer pectic layer and the inner cellulosic layer.

Answer 2

Zygnema. Zygnema is a genus of freshwater filamentous thalloid alga comprising about 100 species. A terrestrial species, Z. terrestre, is known from India. Zygnema grows as a free-floating mass of filaments, although young plants may be found anchored to streambeds with a holdfast.