1. Awasthi, D. D. (1986). Macrolichen taxa of Teloschistaceae from India. Proc. Indian Acad. Sci. (Plant Sci.) 96(3): 227-231. https://doi.org/10.1007/BF03053306
2. Awasthi, D. D. (1988). A key to the macrolichens of India and Nepal. Journ. Hattori Bot. Lab. 65: 207-302
3. Awasthi, D.D. (1991). A key to the microlichens of India, Nepal and Sri Lanka. Biblioth. Lichenol. 40: 1-337. https://doi.org/10.2307/1222799
4. Awasthi, D.D. (2007). A compendium of the macrolichens from India, Nepal and Sri Lanka. Bishen Singh and Mahendra Pal Singh, Dehra Dun
5. Awasthi, G. (1986). The lichen genera Usnea from India and Nepal. J. Hattori. Bot. Lab., 61: 333-421
6. Easa, P.S. (2003). Biodiversity, Documentation from Kerala, Part 3: Lichens. Handbook No. 17. Kerala Forest Research Institute, Peechi, Thrissur, Kerala
7. Kumar, M. (2000). Lichen (Macrolichen) flora of Kerala Part of Western Ghats. KFRI Res. Report No. 194. Kerala Forest Research Institute, Peechi, Thrissur, Kerala
8. Kumar, M. and Sequiera, S. (1997a). Lichen flora of Western Ghats: An Appraisal. J. Econ. Tax. Bot. 21(1): 27-39
9. Kumar, M. and Sequiera, S. (1997b). New records of macrolichens from Silent Valley, Kerala. J. Econ. Tax. Bot. 21(1): 67-73
10. Kumar, M. and Sequiera, S. (1999). Lichens of Western Ghats: An Overview. In: K.G. Mukherji, B.P. Chamola, D.K. Upreti & Upadhayay, R.K. (eds.) Biology of Lichens. Aravali Books International, New Delhi
11. Kumar, M. and Sequiera, S. (2001). On a collection of macrolichens from New Amarambalam Reserve Forests, Southern Western Ghats, India. J. Econ. Tax. Bot. 25(1): 239-246
12. Kumar, M. and Sequiera, S. (2002). An Enumeration of macrolichens from Palakkad District, Kerala State, India. Indian J. For. 25(3): 347-353
13. Kumar, M. and Sequiera, S. (2003). Notes on a collection of some lichens from Chembra and Thirunelly Hills of Wayanad District of Kerala State, India. J. Econ. Tax. Bot. 27 (Suppl.) 1029-1039
14. Mukherji, K. G, Chamola, B. P., Upreti, D. K. and Upadhayay, R. K. (1999). Biology of Lichens. Aravali Books International, New Delhi
15. Nayar, T.S. (1995). A concise review of forest flora of Kerala. Journal Bombay Nat. Hist. Soc. 92: 212-219
16. Vivekananthan, K. (1981). Floristic studies in Idukki district, Kerala. Bull. Bot. Surv. India 23: 100-104
17. Vohra, J. N., Roy Choudhary, K. N., Ghosh, P. K., Kar, B. D. and Singh, K. P. (1982). Observations on the Cryptogamic flora of the Silent Valley. Botanical Survey of India, Howrah
18. Walker, F.G. and James, P.W. (1980). A revised guide to microchemical techniques for the identification of lichen substances. Bull. Brit. Lichen. Soc. 46: 13-29