CONTENTS 



SECTION IX 



CLASS IV. PSYCHROPHYTES. FORMATIONS ON 

 COLD SOIL 



CHAPTER PAGE 



LXV. CLIMATIC CONDITIONS IN SUBGLACIAL FELL-FIELDS . 248 



LXVI. ADAPTATION OF SPECIES IN SUBGLACIAL FELL-FIELDS 251 



LXVII. SUBGLACIAL FELL-FIELD FORMATIONS . . .256 



SECTION X 



CLASS VII. PSAMMOPHYTES. FORMATIONS ON SAND 



AND GRAVEL 



LXVIII. OECOLOGICAL FACTORS. FORMATIONS . . . 262 

 LXIX. SHIFTING, OR WHITE, SAND DUNES . . . 263 

 LXX. STATIONARY, OR GREY, SAND-DUNE. SAND-FIELDS. 

 DUNE-HEATH. DUNE-BUSHLAND. DUNE-FOREST. 

 OTHER EXAMPLES OF PSAMMOPHILOUS VEGETATION 265 



SECTION XI 



CLASS IX. EREMOPHYTES. FORMATIONS ON DESERT 



AND STEPPE 



LXXI. OECOLOGICAL FACTORS. FORMATIONS . . . 273 



LXXII. DESERT 274 



LXXIII. SHRUB-STEPPE 278 



LXXIV. GRASS-STEPPE ' . . 2 8i 



LXXV. SIBLJAK 288 



SECTION XII 



CLASS VIII. CHERSOPHYTES. FORMATIONS ON 



WASTE LAND 

 LXXVI. WASTE HERBAGE . . . . . 2 g 9 



LXXVII. BUSHLAND ON DRY SOIL 2 g T 



SECTION XIII 



CLASS X. PSILOPHYTES. SAVANNAH-FORMATIONS 

 LXXVIII. SAVANNAH-FORMATIONS 

 LXXIX. THORNY SAVANNAH . 

 LXXX. TRUE SAVANNAH 



LXXXI. SAVANNAH-FOREST 



2 99 



