546 



Subject Index 



Photoperiodic induction, 315 

 Photoperiodism, effect, 315 



on chromosome number, 322 

 on flowering, 315 

 on leaf structure, 321 

 on lower plants, 317 

 on parasite and host, 397 

 on root-shoot ratio, 320 

 on sex determination, 317 

 on tuberization, 320 

 on vegetative structures, 319 

 Photothermal induction, 339 

 Phragmites, 35, 445 

 Phragmoplast, 25, 80 

 Phragmosome, 25, 43 

 Phycomyces, 21, 149, 165, 400 

 Phyllocaline, 396 

 Phyllocladus, 169, 208 

 Phyllody, 277, 317 

 Phyllogen, 89 

 Phyllotaxy, 66, 150 

 decussate, 151 



experimental modification, 160 

 Fibonacci series in, 152 

 fractional divergence, 152 

 genetic spiral, 151 



direction, 164 

 at meristem, 71 

 spiral, 151 

 theories, 156-163 

 Physarum, 314 

 Physiological age, 210 

 Phytohormones, 375 

 Picea, 189, 263 

 Pilobolus, 318, 400 

 Pisum, 250 

 Plagiotropic axes, 189 

 Plantefol's theory of phyllotaxy, 156 

 Plasmodiophora, 138 

 Plastochron, 66, 68 

 Plastochron index, 66 

 Plastochron ratio in phyllotaxy, 162 

 Plectranthus, 89 

 Plerome, 60 

 Pleurococcus, 119 

 Poa, 280, 320 

 Podophyllum, 187, 350 

 Podostemon, 237 

 Pogonia, 247 



Polar patterns in organic form, 142 

 Polarity, 116-146 



aspect of differentiation, 118 

 in auxin flow, 141 



bioelectrical effect on, 361 

 cambial cells, 128, 130 

 cell, 131 



in cell division, 131 

 cell wall, 132 

 in cellular slime molds, 143 



Polarity, as component of organization, 

 449 



definition, 117 



determination, 137 



and developmental pattern, 142 



electrical, 139 



in embryonic development, 126 



in external structure, 119-126 



factors of induction, 117 



and gradients, 145 



in grafts, 129 



in isolated cells, 135 



in leaf cuttings, 124 



loss, 137 



in lower plants, 121 



of movement in phloem, 141 



in plasmodia and coenocytes, 138 



in pseudoplasmodium, 225 



in regeneration, 119 



reversal, 125 



in root cuttings, 124 



in root-hair cells, 131 



in single cells, 134 



in stem cuttings, 123 



three aspects, 144 



in tissue reorganization, 127 



transverse, 123, 361 

 Polarized growth in leaves, 90 

 Polyembryony, adventive, 256 



cleavage, 206, 235 

 Polygonum, 311, 330 

 Polyploid series, 35, 436 

 Polyploidy, 436 



and cell shape, 440 



and cell size, 35, 437 



distribution among growth forms, 440 



and organ shape, 440 



and organ size, 439 



and plant size, 438 



produced by colchicine, 436 



somatic, 441 

 Polypodium, 239 

 Polysomaty, 441 



and cell size, 35 



and cellular differentiation, 445 



distribution in plant, 442 



and photoperiodism, 442 

 Polysphondylium, 226, 366 

 Populus, 279, 282, 284, 404 

 Potamogeton, 192, 216, 217, 331, 370 

 Potassium, role in development, 370 

 Potency of cell, 306 

 Potentilla, 284 

 Pressure and plane of cell division, 49, 



346 

 Primary tissues, origin, 79 

 Primula, 35, 70, 110, 238, 445 

 Proserpinaca, 216, 217, 330 

 Protein synthesis in root tip, 42 



