422 



PLANT SOCIOLOGY 



Iron bacteria, in moor waters, 190 



chlorosis, 180 



soils, plants of, 190 

 Irradiation in mountains, 262 

 Irrigation, effect on vegetation, 285 

 Isobiochores, 299 

 Isocies, 366 

 Isoetes, 290 



echinospora, 184, 352 



lacustris, 184 



setacea assn., 220, 375 

 Isoetetalia, 375 

 Isoetetum, 110 

 Isoetion, 375 

 Isohyets, 114 

 Isolepis setacea, 364 

 Isothecium myurum, 16 

 Isothermal Unes, 96, 262 

 Isotherms and boundaries of vegeta- 

 tion, 87, 92 



and exposure, 264 



in Swiss Alps, 262 



Jaccard's curves, 54 

 Juncetalia maritimi, 375 

 Juncetum trifidi, 136, 137 

 Juncion maritimi, 375 

 Juncus acutiflorus bog, 45 



bufonius, 364 



capitatus, 364 



-Isoetes duriaei assn., 302, 375 



compressus, 364, 375 



gerardi assn., 375 



maritimus, 128, 192 



subulatus, 193, 197 



tenuis, 364 



trifidus, 61, 120 

 Juniperus 9, 37, 338 



communis, 38, 150, 275, 333 



macrocarpa, 275 



nana, 119 



oxycedrus, 276, 316, 326 

 Jussieua, 16 



K 



Kalidium caspicum assn., 202 

 Kernera saxatilis, 320 



Kleinia, 296 

 Knautia arvensis, 59 

 Kochia, 205 



hirsuta assn., 11, 374 



prostrata, 112 

 Koeleria gracilis, 61, 66 

 Koenigia islandica, 299 

 Krameria canescens, 226 



Lacinaria punctata, 328 

 Lagoon vegetation, 197 

 Lappula-Asperugo assn., 271 

 Larch forest, 42, 134, 270 

 Larix, 146 



decidua, 134, 245 

 forest, 87, 270, 317 



-Pinus mixed forest, 174, 263, 347 



sibirica, 87 

 Laterite, 256 

 Lathyrus, 289, 292 



setifolius, 50 

 Lavandula latifolia stage, 326 



stoechas- Erica scoparia assn., 280, 281 

 Lavanduletalia stoechidis, 376 

 Law of relativity, 180 



of the minimum, 181 

 Layered communities, 370 



vegetation, 335 

 Layering, concept of, 41, 42 



factors causing, 43 



influence on temperature, 85 



of roots, 43, 44, 45 



of vegetation, 26 

 Layers, fusion of, 42 



subterranean, 42, 44 

 Leaf mould, 251 



size classes, 296 

 Leaves, structure of, 101 

 Lecanora frustulosa, 241 



gibbosa, 38 



lamarckii assn., 184 



maura, 46 



melanophtalma, 241 



polytropa, 38 



reuteri assn., 184 



subfusca, 16 

 Ledum palustre, 9 

 Lemna, 290, 370 



