502 



INDEX 



Photosynthesis, economic importance 



of, 15-16 

 Phycocyanin, 165 

 Phycomycetes, 218 

 Phyllactinia, 247 

 Phylloglossum, 343, 344 

 Phytophthora, 221, 223 

 Picea, 375, 376 

 Pierce, 190 

 Pigments, 32 

 Pileus, 260 

 Pilobolus, 226 

 Pinales, 362 



classification of, 375 

 Pine, 365, 366, 368, 369, 371, 372, 374, 



375 



wood, 94, 363 

 Pinguicula, 480 

 Pinnularia, 169, 172 

 Pistil, 115, 116, 399 

 Pit, 398 



Pith, 76, 78, 314-315. 324. 342 

 Placenta, 388, 389 



free central, 474 

 Plankton, 168, 169 

 Planktoniella, 169 

 Plant, nature of, i 



cell, I 

 Plasmodium, 151, 152 

 Plasmopara, 221, 222 

 Plastids, 2, 17 

 Pleurococcus, 182 

 Plowrightia, 239, 240 

 Plumule, 125, 126, 398, 428 

 Pod, 127, 130, 398, 451, 454, 455 

 Poison ivy, 459, 460 



sumac, 459, 460 

 Poisonous secretions, 39, 40, 53, 265, 



442, 459, 469, 481 

 Polar nucleus, 118, 119, 389 

 Polemoniales, 474 

 Pollen grains, 116, 120, 122 

 Pollinium, 424, 425, 474 

 Polygonales, 437 

 Polypodium, 329 

 Polyporaceae, 264 

 Polysiphonia, 212 

 Polystichum, 311, 322, 328 



Polytrichum, 302, 303, 306 



Pond scum, 185 



Poplar, leaf arrangement, 28 



order, 429 

 Poppy, family, 442 



order, 442 

 Pore, II, 80, 81, 94, 264, 265, 283, 363 

 Porella, 289 

 Potato, 481 



rot, 221 

 Prepotency, of foreign spores, 454 

 Primitive plants, 46, 154 

 Primrose order, 473 

 Primulales, 473 



Pro-embryo, 359, 360, 371, 395, 396 

 Prosenchyma, 11 

 Protandrous, 283 

 Prostrate stems, 109 

 Protection of microspores, 412 

 Proteids, 16 

 Proteid grains, 18, 19 

 Prothallium, 312, 317, 330, 331, 370 

 ProtogynouE, 283 

 Protomyxa, 153 

 Protonema, 308, 309 

 Protoplasm, function of, 3 



nature of, 2, 3 

 Protoplasmic connection of cells, 3 

 Pruning, 100, 102 

 Prunus, 451 

 Pteridophyta, 311 

 Pteridium, 329 

 Ptomaines, 159 

 Puccinia, 251, 252, 253, 255 

 Puffball, 266, 267 

 Pulvinus, 35 



Purposive reactions, 5, 36, 104 

 Pussy willow, 430 

 Pustules, 258 

 Pycnium, 252 



Pycnidium, pycnidia, 233, 252 

 Pycnidiospores, 252 

 Pyrenoids, 185, 186 

 Pyrola, 384, 470, 471 

 Pyronema, 229, 230 



Quarter-sawed oak, 95 

 Quercus, 146, 383, 434 



