468 



INDEX 



Plant, naturalized, i 



organs, 121-218 



perennial, 124 



tissues, 90-120 



zoophilous, 200 



Plantaginaceae, placenta tion in, 197 

 Plasma membranes, 61, 73 

 Plasmodiocarp, 231 

 Plasmodium, 230 , 

 Plasmolysis, figure illustrating, 69 

 Plastids, 68, 69 

 Platystemon, 332 

 Plectascales, 256 

 Plerome, 100, 122 

 Pleurococcaceae, 232 

 Pleurococcus, 232 

 Pleuston, 409 

 Plum, 209, 338 

 Plumule, 121, 135 

 Pod, 206 



Fig. of, 205 

 Podophyllum, 327 



peltatum, 327, 328 

 Polemoniales, 386 

 Pollen, 54, 55, 193, 195 



maturation of, 55 

 Pollen grains, Fig. of, 194 



germinating, 56 



pine, 83 



Pollination, 50, 56, 199 

 Pollinia, 195 

 Polyembryony, 59 

 Polygala, 96 



lutea, 355 



senega, 354, 355 

 Polygalaceae, 354 

 Polygonaceae, 197, 321 

 Polygonales, 321 

 Polygonatum, 302 

 Polygonum, 321 



Bistorta, 322 

 Polypodiaceae, 292 

 Polyporaceae, 274 

 Polyporus, enzyme in, 95 



Polyporus, officinalis, 274 

 Polytrichum commune, Fig. of, 285 



life history of, 286, 287 

 Pome, 209 



of apple, Fig. of, 210 

 Pomegranate Family, 371 

 Ponteria, 380 

 Poplar, 312 

 Poppy , calyx of, 184 



Family, 332 

 Populi Gemmae, 312 

 Populus balsamifera, 312 



nigra, 312 

 Pore Fungi, 274 

 Porella, 283 

 Potato, 391 

 Potentilla, 185 



silvestris, 341 

 Prefloration, 181 

 Prefoliation, 157, 158 

 Prickles, 138 

 Primula, style of, 199 

 Primulacese, placenta tion in, 197 

 Principes, 299 



Principles of classification, 2, 3 

 Privet, 381 



California, 127 

 Proembryo, 242 

 Promycelium, 267 

 Proportions of stamens, 189 

 Protective tissues, 120 

 Proteins, 40, 89 



tests for, 89 

 Prothallial cushion, 43 

 Prothallus, 41', 290 

 Protoascales, 251 

 Protobasidiomycetes, 267 

 Protococcales, 232 

 Protonema, 41, 283 

 Protophloem, 127, 129, 143 

 Protophyta, 219 

 Protoplasm, 62 



properties of, 62, 68 

 Protoplasmic cell contents, 68-70 



