A thallus is a multicellular flattened algal body that arises from two different planes of cell division. A filament is also a multicellular algal body but it arises from one plane of cell division that is perpendicular to the long axis of the filament.

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A thallus indeed refers to a multicellular, often flattened algal body that develops from cell divisions in multiple planes, contrasting with a filament, which forms from cell divisions in a single plane perpendicular to the filament's long axis, resulting in a linear chain of cells.

A Thallus Is a Multicellular Flattened Algal Body That Arises