Subject Index 



547 



Protosiphon, 43 



Protostele, 72 



Primus, 279 



Pseudoplasmodium in Acrasiaceae, 223 



Pseudotransverse division in cambial cells, 



81 

 Pseudotsuga, 78 

 Psilntum, 282 

 Pteridium, 175 



Pteridophytes, shoot meristem in, 68 

 Pyronema, 233 



Quiescent center in root apex, 78 

 Quincuncial arrangement of floral parts, 

 167 



Ranunctdus, 216, 330, 343 



Raphanus, 250 



Ratio between rays and vertical cells in 



wood, 83 

 Ray initials, at cambium, 80 



origin, 83 

 Rays, uniform distribution, 83 

 Reaction wood, 103, 193, 355 



in angiosperms, 357 



and auxin, 358 



in conifers, 355 



longitudinal compression in, 356 



regulatory action, 356 

 Reactivity of cell, 306 

 Recapitulation in juvenile traits, 1 

 Reciprocal crosses, role of cytoplasm in, 



435 

 Reconstitution in regeneration, 235-244 



basipetal character, 242 



fem leaf, 239 



fern prothallium, 240 



in kohlrabi tuber, 244 



root meristem, 236 



shoot meristem, 237 



after splitting of meristem, 237 



tissue patterns, 240, 244 

 Regeneration, 230-257 



bryophytes, 234 



buds on hypocotyls, 245 



defined, 231 



epidermis under wound cork, 241 



in flowers, 250 



fungus fruiting body, 233 



in gametophytes, 250 



in higher plants, 235 



indifferent primordia, 248 



individual cells, 233 



in inflorescences, 250 



after injury, 230 



in leaf cuttings, 249 



in lower plants, 232 



Regeneration, after physiological isola- 

 tion, 231 



protonema from sporophyte, 234 



by reconstitution (see Reconstitution 

 in regeneration ) 



redifferentiation in, 241 



reproductive, 235, 250-257 



by restoration, 235, 244-250 



from root cuttings, 247 



self-regulation in, 231 



shoots from leaves, 252 



from single cells in algae, 233 



from single epidermal cells, 245, 253, 

 255 



split meristems, 238 



from stem cuttings, 245 



vascular strands, 242 



in vegetative propagation, 244 

 Rejuvenescence, 210 

 Relations, importance, 3 

 Relative conducting surface, 334 

 Relative growth, 105 

 Relative growth constants, segregation, 



423 

 Reproductive apex, development, 67 

 Reproductive regeneration, 235, 250- 



257 

 Reseau de soutien, 201 

 Restoration in regeneration, 235, 244- 



250 

 Retinospora, 214 

 Reversibility of ontogenetic change, 214 



effect of gibberellin on, 214 

 Reversion to juvenile state, 217 

 Rhizobium, 295 

 Rhizocaline, 394 

 Rhizophore, 248 

 Rhythms, endogenous, 322 

 Ricinus, 191, 351, 352 

 Ripeness to flower, 205 

 Robinia, 282 

 Root apex, 75-79 



physiology, 78 



in tissue culture, 78 



tissue differentiation, 77 



"types," 78 

 Root formation, effect of leaves on, 393 

 Root-forming hormones, 247, 392 

 Root nodules, as cataplasmatic galls,, 

 295 



tetraploidy in, 442 

 Root-shoot ratio, 96 

 Rotholz, 356 

 Rudbeckia, 222, 338 

 Rumex, 185, 430 



Sachs's rule in cell division, 44 

 Sagittaria, 216 



