548 



Subject Index 



Saintpaulia, 239, 253, 255 



Salix, 128, 282 



Samhucus, 279 



Sanio's laws, 36 



Sarracenia, 187 



Sauromatum, 442 



Scenedesmus, 343 



Schizaea, 203 



Schizostegia, 169 



Scion in grafting, 258 



Sclerotinia, 338 



Scolopendrium, 239 



Scorpioid cyme, 178 



Secondary tissues, 80 



Sectio aurea, 153 



Sedum, 192, 255, 437 



Seed size and plant size, 97 



Segregation in somatic cells, 274 



Selaginella, 12, 58, 171, 172, 175, 202, 



248 

 Self-differentiation, 24, 73 

 Self-regulation, in development, 452 



in regeneration, 231 

 Sempervivum, 395 

 Senescence, 38, 205, 211 

 Sequoia, 110, 159 

 Sex chromosomes in plants, 429 

 Sex determination, 430 

 Sex hormones in fungi, 400 

 Sex inheritance, XY type, 429 

 Sex-linked traits in plants, 429 

 Sex reversal by environmental factors, 



317, 428 

 Shade leaves, 312 



Shaking as substitute for light in develop- 

 ment, 346 

 Shoot apex, 59-75 



chemical organization, 73 



compared to organizer, 73 



culture, 70, 73 



ontogeny, 65 



organized system, 74 



role in differentiation, 70, 73 



size and stelar development, 72, 

 222 



totipotence, 70 



in various ecological types, 65 



in various plant groups, 65 

 Short-day plants, 315 

 Short-day shape of leaves, 315, 395 

 Sigmoid curve of growth, 13 

 Similitude principle, 359 

 Sinapis, 346 

 Siphonostele, 72 

 Sirenin, 400 



Size, absolute, importance in develop- 

 ment, 359 



in relation to form, 361 

 Sliding growth, 81, 83 



Soap bubbles, division, 46 



resemblance to cells, 44 

 Solanum, 261, 264, 268, 269 

 Solidago, 432 

 Somatic mutation, 273 

 Sophora, 263 

 Sorbose, 373 

 Sorocarp development in Acrasiaceae, 



225 

 Sphacelaria, 233 

 Sphaerocarpos, 234, 426, 429 

 Sphagnum, 58, 191 

 Spinacia, 221 

 Spiral grain in wood, 166 

 Spirality, in cell wall, 165 



as component of organization, 164 



omnipresence, 165 

 Spirogyra, 38, 56, 119, 147, 150 

 Sporobolus, 131 

 Stellaria, 167, 177 

 Stentor, 455 

 Stereum, 233 

 Stichococcus, 311, 314 

 Stimulation and inhibition, balance be- 

 tween, 103 

 Stock in grafting, 258 

 Stock-scion interrelations, 262 

 Stomatal index, 325 

 Storied woods, cell length in, 37 

 Streckungswachstum, 31 

 Streptocarpus, 239, 253, 397 

 Sucrose, morphogenetic effects, 73, 371, 



372 

 Sun leaves, 312 

 Surface-volume ratio, 38 

 Swaying, formative effects, 353 

 Symmetry, 147-180 



axis, 147 



bilateral, 169 



as component of organization, 450 



of crystals, 148 



development, 178 



in cellular systems, 179 

 in coenocytes, 178 



dorsiventral, 147, 170-178 



in flowers, 167 



and form, 180 



in inflorescences, 167 



inorganic and organic, compared 

 148 



pendular, 179 



radial, 147, 149-169 

 lower plants, 150 

 meristems, 179 

 roots, 150 

 shoots, 150 

 Symphoricarpos, 279 

 Symplastic growth, 81 

 Syncephalastrum, 373 



