Abstract: Seasonal variation in vesicular arbuscular mycorrhizae (VAM) of eight aquatic and subaquatic vascular plant species viz.Thelypteris dentata,Marsilea minuta and Adiantum sp (pteridophytes), polygonum barbatumand Oenanthe javanica (dicotyledonous), Paspalum paspalodes, Saccharum sponitaneum and Vetiveria zizanioides( monocotyledonous) was studied. Pteridophytes in general showed maximum VAM colonization during spring with gradual reduction in the following seasons. VAM colonizaton in species of dicotyledonous and monocotyledonous showed a variable response to different seasons. A total of six mycorrhiza forming species belonging to a single genus, Glomus, were found to be associated with the test species. Among these G. fasciculatum and G. mosseae were the most common species and showed a marked variation and typical pattern of seasonal distribution i.e. maximum in spring with the gradual reduction in the following seasons. The other four species were rather inconsistent and lack any seasonal response.