Glossopteris † [Fossil] - The tongue-shaped leaf  Glossopteris, represents a unique group of extinct vascular plants (age : Permian, 250-280 million years). During this period India occupied a position south of equator close to South Pole as a part of a very large continent which included South America, Antarctica, Africa and Australia, called Gondwanaland. This vegetation was responsible for the precious coal reserves in peninsular India. http://www.indiapicks.com/stamps/Nature_Others/NBO_Fossils_Main.htm