PLANT ASSOCIATIONS 231 



(b) Erica Tetralix - Moor. Peat deeper 



and more continually moist than 

 (a) (p. 253). 



(c) Molinia caerulea - Bog. On badly- 



drained peat (p. 251). 



(d) Eriophorum-Moor. On deep peat, 



rainfall high, moisture excessive, 

 and drainage slow (p. 254). 



(e) Myrica-Bog (p. 253). 



(/) Sphagnum-Bog (p. 253). 



(g) Vaccinium-Moor. In alpine zone, 

 replacing heather-moor, Erio- 

 phorum-moor, and grass-heath 

 (p. 255). 



4. Wet soils with much organic matter : 



Juncus and Carex-Bogs (p. 246). 



5. In water : 



Vegetation of Highland Lochs and Moor- 

 pools (p. 238). 



C. Associations with Salt- Water. 



1. Dry soils : 



(a) Sand-dune Ridges (p. 281). 

 (6) Rocks and Cliffs (p. 283). 



2. Wet soils : 



Salt-Marshes and Estuarine Marshes (p. 278). 



3. In water : 



Maritime Aquatic Vegetation (p. 275). 



BIBLIOGRAPHY. 



General Treatises: 



Schimper, A. F. W. : " Plant Geography upon a Physiological Basis." 



Clarendon Press, Oxford. 

 Warming, E. : " (Ecology of Plants." Clarendon Press, Oxford. 



Ecological Distribution : 



Lewis, F. J. : " Geographical Distribution of Vegetation of the 

 Basins of the Rivers Eden, Tees, Wear, and Tyne." Geograph- 

 ical Journal, vols. xxiii. and xxiv., 1904. 



Moss, C. E. : " Geographical Distribution of Vegetation in Somer- 

 set," issued as a separate memoir by the Royal Geographical 

 Society. Edward Stanford, London, 1907. 



