The Cytology of some Athyrium species from Northern India

The present investigation deals with the cytology of genus Athyriumfrom Northern India. Eleven species have been studied and comparisonswith the previous records are made. All the North Indian speciesare sexual and there is a lower percentage of polyploidy comparedwith the species in Ceylon. Their occurrence at high altitudessuggests that the temperate climate may be significant in thisconnexion. Polyploidy is noticed only up to the tetraploid leveland only in two cases.