ABSTRACT
Out of 44 validly known species of Achlya from all over the world, 36 are described from various water bodies in India. This chapter details a total of 9 species of Achlya that could be recovered from alkaline (9 species) and polluted waters (7 species)—the two extreme water systems. A comparison has also been made with those types that are described from other aquatic habitats to strengthen the fact that water molds including species of Achlya have enough potential to adapt to any environmental stresses and thus are plastic in nature.
