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Liverwort and Hornwort Flora of Sikkim, presented in two volumes, is the first a such comprehensive treatise for any Indian state. It presents detailed taxonomic account of 378 species and infraspecific taxa belonging to 96 genera and 51 families of phyla Marchantiophyta and Anthocerotophyta, which accounts for nearly 41 per cent of total Indian liverworts and hornworts documented so far in just 0.22 per cent of its total geographical area.  It includes the description of four species of liverworts as new to science and one as new distributional record for the country, besides several range extensions to the Indian Himalayan region or Sikkim and a number of nomenclatural changes. The study is supported by immaculately drawn 352 camera lucida illustrations, and 150 coloured and black and white photographs showing ultrastructure of leaf surface, spores and elaters under SEM, the oil-bodies, and field photographs of selected taxa, and critical taxonomic notes. It is hoped that the book would serve as identification manual of the Himalayan liverworts and the hornworts and hence useful to not only the students of bryology, but also the foresters, naturalists and the people at large.