1. Awasthi, D.D. (1965). Catalogue of lichens from India, Nepal, Pakistan and Ceylon. Beih. Nova Hedwigia, 17: 1-137.
2. Culberson, C.F. (1972). Improved conditions and new data for the identification of lichen products by a standardized thin layer chromatographic method. J. Chromatogr., 72: 113-125. https://doi.org/10.1016/0021-9673(72)80013-X
3. Culberson, C.F. and Kristinsson, H. (1970). A standardized method for the identification of lichen products. J. Chromatogr., 46: 85-93. https://doi.org/10.1016/S0021-9673(00)83967-9
4. Fink, B. (1935). Lichen Flora of United States. Ann. Arbor. 426 pp, + 47 plates. https://doi.org/10.3998/mpub.9690813
5. Howe, R.H. (1914). North American species of the genus Ramalina. VIII. The Bryologist, 17: 81-87. https://doi.org/10.1639/0007-2745(1914)17[81:NASOTG]2.0.CO;2
6. Kashiwadani, H. (1986a). Genus Ramalina (Lichens) in Japan (1). On Ramalina calicaris (L.) Fr. in Japan. Bull. Nat. Sci. Mus. Tokyo, ser. A, 12(3): 89-98.
7. Kashiwadani, H. (1986b). Genus Ramalina (Lichens) in Japan (2). On Ramalina pacifica Asah. and its allies. Ibid. 12: 117-125.
8. Kashiwadani, H. (1987a). ‘Peruvian species of Ramalina (Lichens)’, in Inoue (ed) ‘Studies on Cryptogams of Southern Peru’, pp.129-144, Tokai Univ. press.
9. Kashiwadani, H. (1987 b). Genus Ramalina (Lichens) in Japan (3). Ramalina exilis Asah. and its allies. Bull. Nat. Sci. Mus. ser. 3, 13(4): 133-140.
10. Kashiwadani, H. (1988 a). Ramalina cochlearis Zahlbr. and R. dissecta Kashiw. sp. nov. (Lichens) in Peru. Ibid. 14(4): 123-128.
11. Kashiwadani, H. (1988b). Ramalina hossei Vain. (Lichens) found in Bhutan and Formosa. Ibid. 14(4): 129-132.
12. Kashiwadani, H. (1990). Some Chilean species of the genus Ramalina (Lichen). Ibid. 16(1): 1-12.
13. Kashiwadani, H. (1992). Ramalina siliquosa (Huds.) A.L. Smith and R. subbreviuscula Asah. in Japan. Mem. Nat. Sci. Mus. Tokyo 25: 63-69.
14. Kashiwadani, H. and Kalb, K. (1993). The genus Ramalina in Brazil. Lichenologist, 25: 1-31. https://doi.org/10.1006/lich.1993.1010
15. Krog, H. and James, P.W. (1977). The genus Ramalina in Fennoscandinavia and the British Isles. Norw. J. Bot. 24:15-43.
16. Krog, H. and Østhagen, H. (1980). The genus Ramalina in the Canary Islands. Norw. J. Bot., 27: 255-296.
17. Krog, H. and Swinscow, T.D.V. (1974). Ramalina species with a hollow thallus (Fistularia) in East Africa. Norw. J. Bot. 21:11-124.
18. Krog, H. and Swinscow, T.D.V. (1975). Some Ramalina species with punctiform pseudocyphellae in East Africa. Ibid. 22: 269-276.
19. Krog, H. and Swinscow, T.D.V. (1976). The genus Ramalina in East Africa. Ibid. 23: 153-175.
20. Lamb, I.M. (1963). Index Nominum Lichenum. Ronald Press, N.Y. 809 pp.
21. Nash, T.H. (ed) (1996). Lichen Biology. Cambridge Univ. Press. 303 pp.
22. Nylander, W. (1870). Recognitio Monographica Ramalinarum. Bull. Soc. Linn. Normnd. ser.2, 4: 101-181.
23. Poelt, J. (1973). ‘Classification’ in V. Ahmadjian & Hale, M.E. (Ed.) The Lichens Appendix. Academic Press, N.Y., pp.599-632. https://doi.org/10.1016/B978-0-12-044950-7.50025-8
24. Schubert, H. and Klement, O. (1966). Beiträge zu Flechtenflora von Nord und Mittelindien. Nova Hedwigia 11: 1-73.
25. Sharma, B.B. and Awasthi, G. (1981). Lichen genus Ramalina subsection Fistularia in India. Misc. Bryol. Lichenol. 9(2): 33-36.
26. Singh, A. (1980). Lichenology in Indian subcontinent, 1966-1977. Economic Botany Information Service, Nat. Bot. Res. Institute, Lucknow, 1-112.
27. Stevens, G. Nell (1982). Ramalina leiodea (syn. R. boninensis) a common maritime species in Oceania. Lichenologist 14: 39-45. https://doi.org/10.1017/S002428298200005X
28. Stevens, G. Nell (1983). Tropical subtropical Ramalinae in the Ramalina farinacea complex. Lichenologist 15: 213-229. https://doi.org/10.1017/S0024282983000365
29. Walker, F.J. and James, P.W. (1980). A revised guide to the microchemical techniques for identification of lichen products. Bull. Brit. Lich. Soc. 46 (suppl.): pp.13-29.
30. Zahlbruckner, A. (1926). Lichenes (Flechten). In A. Engler & K. Prantl. (ed.) Die Naturlichen Pflanzenfamilien, 2 ed. Vol. 8, Leipzig.
31. Zahlbruckner, A. (1930, 1932, 1940). Catalogus Lichenum Universalis. Vol. 6, 8 & 10 respectively, Leipzig, Johnson Reprint Corporation, N.Y.