352 



INDEX. 



Peziza, 184, 185 

 PhsBopliyeese, 134, 161 

 PhsBosporese, 162 

 Phanerogamia, 336 

 Phaseolus, 275 

 Phellogen, 60 

 Phloem, 51 

 Phloxes, 287, 333 

 Phosphorus-assimilation, 79 

 Photosyntax, 77 

 Photosynthesis, 77 

 Phragmidium, 195 

 Phycoerythrin, 171 

 Phycomyces, 148 

 PhycophiEin, 161 

 Phycophyta, 133 

 Phylidracese, 323 

 Phyllactinia, 179 

 Phyllome, 66, 68 

 Phyllospora, 166 

 Phyllosticta, 198 

 Physarum, 181, 133 

 Physcia, 187 

 Physics of vegetation, 90 

 Physiology, 74 

 Phytolaccacese, 329 

 Phytophthora, 153, 154 

 Pickerel-weeds, 323 

 Pilularia, 226 

 Piuacese, 248 

 Pine, 240, 248 

 Pineapples, 325 

 Pinlts, 288, 328 

 Pinus, 240, 248 

 PiperacesB, 331 

 Pirus, 388 

 Pistil, 353, 304 

 Pitcher- leaves, 838 

 Pitcher-plants, 283, 337 

 Pitchers, 69 

 Pith, 58, 345, 393 

 Pitted vessels, 38 

 Pittosporacese, 328 

 Placenta, 310 

 Plane trees, 331 

 Plantaginaceae, 331 

 Plantains, 331 

 Plant-body, 65 

 Plant-cell, 6 

 Plant-food, 75 

 Plant movements, 106 

 Plants for study, 391 

 Plasmodiocarp, 133 



Plasmodium, 183 

 Plasmopara, 153, 156 

 PlatanacesE, 331 

 Plerome, 40 

 Plocamium, 171 

 Plowrightia, 181 

 Plumbaginacese, 831 

 Plum-pocket fungus, 189 

 Plumule, 275, 318 

 Podosphaera, 179 

 Podostemacese, 381 

 Podostemads, 331 

 Pokeweeds, 339 

 Polar disks, 1 1 

 Polemoniacese, 383 

 Polemoniales, 332 

 Pollen-cells, 237, 340 

 Pollination, 258 

 PolygalaceSE, 328 

 Polygalales, 328 

 PolygonaceijB, 339 

 Polypodium, 221, 238-335 

 Polypody, 335 

 Polyporacece, 303 

 Polytricum, 317 

 Pome, 817 



Pond-scum parasites, 136 

 Pond-scums, 138, 141 

 Pondweeds, 323 

 Pontederiacese, 833 

 Poppies, 288, 827 

 Pore-fungi, 303 

 Potato, 389 

 Potato mildew, 154 

 Powdery mildews, 176 

 Preservative for algsB, 148 

 Prickles, 70 

 Prickly fungi, 302 

 Primary meristem, 36 

 Primary roots, 396 

 Primitive flower, 367 

 Primrose, 387, 313, 331 

 Primulacete, 381 

 Primulales, 331 

 Procambium, 55 

 Proteacese, 337 

 Proteads, 337 

 Prothallium, 219, 339, 331, 288, 



240, 343 

 Protococcoidefe, 134. 185 

 Protococcus, 135, 187 

 Protonema, 315 

 Protophyta, 125 



