Abstract
1. Chromosome numbers for thirty species of ferns indigenous to the Palnis have been reported in the present study. All these numbers except those of Botrychium lanuginosum and Sphaerostephanos unitus are first reports from the Palnis.2. The following species are studied cytologically for the first time from S. India: Botrychium daucifolium, Macrothelypteris ornata, Christella papilio, Polystichum setiferum, Hypodematium crenatum.3. Chromosome numbers for the following species have been reported for the first time: Adiantum zollingeri, Microlepia majuscula, Thelypteris confluens, Diplazium sp. (a), D. travancoricum.4. The present study taken together with the previous reports reveals the existence of new cytotypes in the following species: Adiantum raddianum. Macrothelypteris ornata, Christella dentata, Cyclosorus interruptus, Diplazium esculentum, Polystichum setiferum, Hypodematium crenatum.5. Out of fifty three species of ferns known cytologically from the Palnis thirty are polyploids (60 per cent).
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