IXHEX. 



425 



Phascum, sporophytc !~>9 

 Phaseolus, motor organs 205; 



stele of root 75, '*,*'> 

 Phelloderm 109 

 Phloem, bundle of root 72 ; 



secondary 109 

 Photosyntax 166; product 167; 



and respiration 171, 175 

 Phycocyanin 8 

 Phycoerythrin 33 

 Phycophaein 38 

 Phyllodia 124 

 Phyllotaxy 119 

 Physcia 376, 404 

 Physiology 143; apparatus 411; 



experiments 391 

 Phytolacca seed 300 

 Pilobolus, abjection of sporan- 

 gium J5J 



Pilularia, megaspore 214 

 Pimpernel, fruit 303; pistil 245 

 Pine 387, 406; carpel 238; cone 



29S ; shoot 91 ; wood, pene- 

 trated by hyphae 44 

 Pineapple 306 

 Pinesap 283 

 Pistil 237; diagram 285; simple 



and compound 240 

 Pitcher plants 129, 342, 343 

 Pitfalls 342 



Pith, rays 115; stem 107 

 Placenta 244 

 Plasmodia 148 

 Plastids 4 



Plectranthus, hairs 101 

 Pleurococcus 13, 369, 401 

 Pokeberry, seed 300 

 Pollen, grains 249, 250 ; tube 



S4V, 281, 283, 284, 285 

 Pollination 255, 358 

 Polyembryony 294 

 Polygonatum, leaf 127 

 Polygonum, megaspore 292 ; 



stipules 123; tubers i>4 

 Polypodium 61 

 Polyporus 4~ \ fructification 



220, 404 

 Polysiphonia 31. 32, 372, 402; 



cystocarps 288, 28'J ; tetra- 



spores 227 

 Polytrichum 55 



Pondweed, hibernacula ..'<'>.: 



Poplar, mycorhiza 335 



Poppy, ovules .'/-/; protection 



of stamens .!'<>' 

 Porella 379, 405 

 Potassium salts, relation to 



photosyntax 167 

 Potato, pistil 241 ; starch -> ; 



seedling 266 

 Pressure, effect on growth 186; 



root 156 



Prickles 101, 102, 347 

 Proteids 160; grains 169; manu- 

 facture 168 

 Prothallium 60 

 Protonema, mosses 58 

 Protoplasm 2; movements 191; 



naked 147; powers 145 

 Psychotria, domatia 350 

 Pteris, embryo 62 ; origin of 



root 80; ovary 290 

 Puffball 214, 221 

 Putrefaction 162 

 Pyrenoids 21 

 Pyrola, fruit 802 



Radiolarian and algse 338 

 Rainfall, adaptations to 316 

 Ranunculus, leaf 120} nectary 



Raspberry 305 



Reaction 189 



Reagents 409 



Rejuvenescence 268 



Repair 151 



Reproduction 145, 209; adapta- 

 tions 352; sexual 268; vegeta- 

 tive 211 



Resins 176 



Respiration 171; intramolecular 

 172 



Rheum, flower 245 



Rhizoids 22; Chara 31; liver- 

 worts 50; mosses 53 



Rhizome 90 



Rhizopus 374, 403 



Rhododendron, anthers and 

 pollen 249 



Riccia 50 



Rigidity, how secured 149 



Rings, annual, of stem 116 



