374 ECOLOGICAL FACTORS, ETC. 



difference then it should prove possible to extend its use as a 

 means of comparing the vegetation from different regions. Such 

 differences may be expected to open up problems, the solutions of 

 vi^hich should yield us valuable information concerning the general 

 biology and ecology of the species concerned. 



REFERENCES 



Ecology. Baker, S. M. (1909, 1910). New Phytol. 8, 196; 9, 54. 

 Ecology. Berthold, G. (1882). Mitt. Zool. Staz. Neapel^ 3. 

 Ecology. BiEBL, R. (1937). Beih. bot. Zbl. 57 A, 381. 

 Geographical Distribution. Borgesen, F. (1934). Det. Kgl. Danske 



Vidensk. Selsk. Biol. Meddel. 11, i. 

 Geographical Distribution. Borgesen, F. and Jonsson, H. (1905). 



Botany of the Faeroes, 3. Copenhagen. 

 Life Form. Cedergren, G. R. (1939). Bot. Notiser, p. 97. 

 Ecology. Chapman, V. J. (1937). jf. Linn. Sac. (Bot.), 51, 205. 

 Ecology. Ehrke, G. (193 i). Planta, 13, 221, 

 Life Form. Feldmann, J. (1937). Rev. Alg. 10, i. 

 Life Form. Funk, G. (1927). Puhl. della Staz. Zool. Napoli, 7. 

 Ecology. Gail, F. W. (1920). Piihl. Puget Sd Biol. Sta. 2. 

 Life Form. Gislen, T. (1930). Skr. K. Svensk Vetensk. nos. 3, 4. 

 Ecology. Grubb, V. M. (1936). J. Ecol. 24, 392. 

 Ecology. Isaac, W. E. (1933). Arm. Bot., Lond., 47, 343. 

 Ecology. Johnson, D. S. and Skutch, A. F. (1928). Ecology, 9, 307. 

 Geographical Distribution. Jonsson, H. (191 2). Botany of Iceland, 



Part I, p. 58. Copenhagen. 

 Ecology. Klugh, A. B. (1924). Ecology, 5, 192. 

 Ecology. Klugh, A. B. and Martin, J. R. (1927). Ecology, 8, 221. 

 Ecology. Knight, M. and Parke, M. (193 i). Manx Algae, p. 20. 



Liverpool. 

 Ecology. MoNTFORT, C. (1934). Jh. wiss. Bot. 79, 493. 

 Life Form. Oltmanns, F. (1905). Morphologic und Biologic der Algen, 



2, 276. Jena. 

 Ecology. Pringsheim, E. G. (1923). jfb. iviss. Bot. 62, 244. 

 Ecology. Rees, T. K. (1935). jf. Ecol. 23, 69. 



Life Form. Raunkiaer, C. (1905). Acad. Roy. Sci. Let. Dan. 5, 347. 

 Geographical Distribution. Savage, R. E, (1932). jf. Ecol. 20, 326. 

 Geographical Distribution. Setchell, W. A. (1920). Amer. Nat. 54, 



385. 

 Life Form. Setchell, W. A. (1926). Univ. Calif. Publ. Bot. 12, 29. 

 Geographical Distribution. Svedelius, N. (1924). Arch. Bot. 19, i. 

 Ecology. Zanefeld, J. S. (1937). jf. Ecol. 25, 431. 



