Abstract
Lichens are one of the most important biodeteriogens that grow on old building of historical and religious importance and damage a lot. During this study hindeterioration caused by Lichens on the historical monument of Doon valley was studied. This study was conducted on five monuments of Doon valley viz. Guru Ram Rai Darbar Sahib, Tapkeshwar Mahadev Temple, Forest Research Institute, Ashokan Edict and Virbhadra Temple. The study was conducted in rainy, winter and summer seasons. A total number of eight genera are collected from these five monuments. Maximum numbers of genera were collected during rainy season from these monuments in which genera of Crustrose and Foliose were more common.
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