The paper presents an updated list of 250 species of lichens known so far from the state of Assam. 31 species marked by an asterisk (*) are new records for the state. Assam, one of the largest north-eastern states of India with an area of 78,523 km~2,situated between latitudes 24°2' - 27° 6' N and longitudes 89° 8' - 96° E, is well known for its plant wealth. Lichenological study in Assam was initiated way back in 1879 by a Scottish lichenologist J. Stirton. But the state remained poorly studiedcompared to adjoining hill states viz. Arunachal Pradesh, Manipur, Nagaland and Meghalaya. To bridge the gap, the work on lichen flora of Assam was initiated under a Ministry of Environment and Forests, New Delhi sponsored project entitled All India Co-ordinated Project on Taxonomy (AICOPTAX) at Botanical Survey of India.
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