eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2015-08-15 12 2 1373 1379 2624 article Simin Younesi* 1 Taher Nejadsattari 1 Rahele Hasani 1 Department of Biology, Faculty of Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran. Ilam province is located between 45^◦ 24' to 48^◦ 10' Eastern longitude and 31^◦ 58' to 34^◦ 15' northern latitude (west of Iran). Persian Gulf withdrawal in quaternary period caused to the development of alluvial plains that can be seen in West, South and Southwest areas of Ilam.  Lichens from Kabirkooh and Dynarkooh Mountain, Dehloran and Mosian plain and Iran-Iraq border were collected during 2007 and 2008. All collected samples were recognized based on the morphology, chemistry and by use of identification keys. Among 300 collected samples, 14 genera and 25 species were introduced. Most of them are Saxicolous, Terricolous, Lignicolous and Lichenicolous and two genera of the Chrysothricaceae Collemataceae family were reported from Iran for the first time. https://www.biotech-asia.org/vol12no2/lichen-floristic-study-from-southeast-of-ilam-province-iran-dehloran-abdanan-darehshahr/ lichens; morphology; chemical testing; Floristic Study; Iran