Agar is added in a concentration of 1.5% to solidify liquid media. Although there are different concentrations of agar used to create different conditions such as in Sabouraud's Agar and semisolid agar.
Agar comes from Red Algae (primarily the Gracilaria genus). It mainly is produed from the red algae Gracilaria lichenoides. This algae is harvested along the western coast of the United States and in parts of Asia. To extract the agar… Full Answer