Actinella cholnokii is typically observed as small, spherical or oval-shaped cells, occurring either individually or in groups. Each cell features a single, cup-shaped chloroplast that houses one or more pyrenoids. The cell walls are generally smooth, and slight variations in appearance may occur due to environmental factors and developmental stages. This species is commonly found in freshwater environments, where it fulfills ecological roles within aquatic ecosystems. Its physical characteristics and cellular composition are pivotal for its adaptation and reproductive processes in its natural habitat.