Azolla Filiculoides: First Report from Himachal Pradesh

One of the most fascinating of all plants intimate symbiotic associations is Azolla-Anabaena association. It involves a tiny aquatic water fern (Azolla) belonging to monotypic family Azollaceae and a microscopic filamentous blue-green alga or cyanobacterium Anabaena belonging to family Nostocaceae of Cyanophyceae. In this short communication morpho-taxonomic characters and the practical uses of Azolla are described and the species Azolla filiculoides is reported for the first time from Himachal Pradesh.