Agar, Alginic acid, Carrageen , and Funori in seaweeds are

A phycocolloid is thus simply a seaweed gum. The various gums of the red algae are closely related chemically and generally consist of at least two major polysaccharide compounds, one being responsible for their gelling powers, the other for their viscosity. these  hydrocollid components present in cell wall  of red algae .