👉 A polypodiastrum is a type of algae that produces a large, spherical structure called an algaocyst, which can be found in various marine environments such as oceans and freshwater systems. These algal cysts contain a complex network of cells and structures, including a cell wall, microtubules, and a cytoplasmic sac. The polypodiastrum is known for its unique shape and appearance, often resembling the shape of a small sphere or a spherical ball