Seaweeds made up of “boxy” cells like those of higher plants are termed parenchymatous. Others in cross-section appear to be parenchymatous but are in fact really made up of interwoven filaments.

Which algae show Parenchymatous form of algae?

I. Ulva flexuosa (filamentous and plant-like alga), a parenchymatous alga forming large macroscopic tubes or sacs.

What is Siphonous form in algae?

siphonaceous (siphoneous) Applied to algae in which the thallus is not divided up by septa, i.e. the many nuclei are not compartmentalized into cells. The typical siphónaceous alga has a large central vacuole surrounded by a layer of protoplasm, containing nuclei and chloroplasts, which lines the cell wall.