INDEX 



427 



pH curves, measurement of, 167 



of soils, 167 



tolerance of plants, 169 



values, lines of, 172, 178 



plant communities and, 65, 170, 



179 

 profiles, 172, 173, 189 



variations, 65, 172 

 Phagnalon sordidum, 373 

 Phanerophytes, 295 



and layering, 301 

 Pharcidia lichenum, 289 

 Phascum, 289 



Phases, developmental, of the associa- 

 tion, 321 

 Phenological phenomena, 47, 91 

 Phenotypic characteristics, 298 

 Phillyrea angustifolia, 130 

 Philonotis, 293 



fontana, 310 



seriata, 85 

 Phippsia aJgida assn., 121 

 Phleum alpinum, 310 



arenarium, 67 



-Plantago arenaria assn., 376 

 Phlomis salicifolia, 329 

 Phlyctis argena, 16 

 Pholiurus pannonicus, 205 

 Phoma, 236 



betae, 169 

 Photic regions, of lakes, 109 

 Photographs, records of vegetation, 333 

 Photometer, 110 

 Photometry, 105 



in water, 110 



{See also Light measurements) 

 Photoperiodism, 102, 103 

 Photosynthesis, curves of, 97 



related to light, 97 

 Phototropism of shoots, 100 

 Phragmiles, 76 



communis, 13, 37 



isiacus assn., 206, 374 

 Phragmitetaha, 371, 375 

 Phragmition, 375 

 Phyllitis hybrkla, 101 

 Physalis heterophylla, 328 

 Physcietum, 241 

 Physcomitrium, 289 

 Physica tribacia, 241 



Physical soil theory, 160 

 Physiognomic units, 302 

 Physiological dryness, 126, 192, 250 

 Phyleuma, 292 



hemisphaericum, 72, 365 

 pedemontanum, 25, 59 

 spicatum, 69 

 Phytochromatic spectrum, 107 

 Phytoedaphon, 75, 76, 289, 370 

 Phytoplankton, 75, 289, 366 

 Phytosociological classification, 354 

 Phytosociology, 1 

 Picea, 146, 332, 338 

 canadensis, 109 



excelsa, 17, 33, 69, 109, 137, 228, 245, 

 263 

 forest, 87, 317, 323, 332 

 sitchensis forest, 66 

 Piceetum, 59, 61, 344 

 excelsae, 323 

 myrtilletosum, 344 

 Pilularia minuta, 220 

 Pine, 147, 156 



forests, 41, 67, 331 

 {See also Pinus) 

 Pinetum montanae cladoniosum, 124 

 ericosum, 125 

 hylocomiosum, 124 

 rhodorosum, 125 

 Pinion salzmanni, 377 

 Pinus, 89, 338 

 aristata, 7, 8 

 banksiana, 109, 141, 217 

 ce7nbra, 9, 263, 330, 331 



forest, 42, 87, 331, 332, 347 

 halepensis, 42, 174, 316, 317, 377 

 -Larix forest, 263, 332 

 montana, 119, 124, 156, 245, 331 

 forest, 41, 330 

 prostrata zone, 347 

 mitgho, 61, 308 

 pinaster, 183 

 ponderosa, 266, 267 

 pximilio, 350 

 resinosa, 109 

 salzmanni-Quercus pvhescens assn., 



377 

 silvestris, 14, 33, 143, 146, 210, 245, 

 280, 281 

 forest, 67, 108, 211, 330, 353 



