INDEX 



423 



Length of day, influence of, 102 

 Lcontodon montanus, 44, 242 



pyrenaicus, 72, 365 

 Lcontopodium alpinum, 71, 188 

 Lcpidium cartilagineum, 205 



perfoliatum, 205 



ruderale, 205 



subulatum, 186, 197 

 Leptophyls, 296 

 Leptoscyphris taylori, 89 

 Lepturus incurvatus, 205, 374 

 Lcskeella, 109 



Lcucodon spp., 268, 209, 292 

 Leucojum vernum, 91 

 Lianas, 7, 296, 368 

 Lichen association, 301 



associations, Mme aA'oiding, 184 



communities, 241, 371 

 hme constant, 184 



seres, 335 



vegetation on dolomite, 187 

 Lichens, epiphytic, 269 



fruticose, 292 



pioneer, 209 

 Lichtgenuss, 51, 104 

 Life forms, 21, 287, 291, 293, 294, 296 

 adaptability of, 297 

 ecological significance of, 299 

 in plant geography, 298, 300 

 Raunkiaer's system of, 288 

 Warming's, 287 

 Life zones, great, 345 

 Light, annual curve of, 108 



climates, 105 



conditions and growth, 100 



diffuse, 97 



direct, 97 



effect upon constructive metabolism, 

 99 

 upon flowering, 99 

 upon germination, 99, 100 



factor, 17 



in deserts, 106 



in European forests, 109 



in mountains, 106 



in forests, 105, 108, 109 



in water, 110 



influence on structure, 100 



intensity, of forest floor, 111 



interception, 106 



Light, measurements, 105 



minimum, 108 



of snowland, 110 



phase of forests, 51 



physiologic-ecologic effect of, 97 



radiant heat and, 97 



rays, 83 



reflection of, 106, 107 



requirement, 51, 105, 108 

 of communities, 110 

 of Fagus, 101 

 of Tsriga, 102 



zonation, in lakes, 109 

 Ligularia sibirica, 45 

 Liguslicum mutellina, 122, 155 



simplex, 71 

 Lime-avoiding species, 183 

 {See also Calciphobes) 



chlorosis, 180 



direct action of, 183 



indirect action of, 182 



plants, 159 



{See also Calcicoles) 

 Limit of forest, 93 

 Limnetic communities, 370 

 Limoniastrum, 201, 374 

 Lindernia pyxidaria, 364 

 Line transects, 357 

 Lines of pH values, 172 

 Linnaea borealis, 67, 292 

 Linum, 89, 289 

 Lister a cor data, 61, 66-68 

 Lithospermum fruiicosum, 317 

 Litorelletalia, 371 

 Litter, forest, 245 



acidity of, 174 

 Littoral associations, 67 



zonation, 346 

 Lloydia serotina, 71 

 Lobarietum pulmonariae, 133 

 Lobelia dortmanna, 290 

 Loess, 210 

 Loiseleuria, 251 



procumbens, 86, 149, 152, 155, 294 

 Loiseleurietum, 247 



alectorietosum, 155 



cetrariosum, 89, 120, 121, 155, 300 

 Loliiim perenne, 14 

 Long-day plants, 102 



