Algae have cell wall made up of

NCERT states: 'Algae have cell wall made of cellulose, galactans, mannans and minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose, pectins and proteins.'
So cellulose, galactans and mannans are the components characteristic of algal cell walls.
Hemicellulose, pectins and proteins are the components of the cell walls of higher plants.
Hence algae have a cell wall made up of cellulose, galactans and mannans.