5io 



INDEX. 



Phyllidium, 371 



Phylloclades, 373, 395 



Phyllotaxy, 375, 384 



Physical condition of soil, 465 



Physical factors, 465 



Phytolaccaceae, 495 



Phytomyxa leguminosarum, 92 



Phytophthora, 182, 184, 215 



Pickerel weed, 493 



Pilularia, 296 



Finales, 216 



Pine, white, 297-310 



Piperales, 494 



Pitcher-plant, 496 



Pith, 50 



Plant-food, sources of, 81 



Plant-formations, 496 



Plant-substance, analysis of, 79, 



80 



Plantaginales, 501 

 Plantago, 501 



Plasmolysis (plas-mol'y-sis), 19 

 Plasmopara, 183, 215 

 Plectascales, 217 

 Plectobasidiales, 220 

 Pleurococcaceae, 161 

 Pleurococcus, 161 

 Plum family, 497 

 Plumule, 99 

 Podostemon, 496 

 Poison-hemlock, 499 

 Poison-ivy, 497 

 Poison-oak, 497 



Poisonous mushrooms, 207, 208 

 Poison-sumac, 497 

 Pokeweed, 495 

 Polemoneales, 500 

 Pollen-grain, 299, 305 

 Pollination, 303, 304, 420, 430, 433- 



449 



Pollinium, 420 

 Polygonales, 495 

 Polygonum, 495 

 Polypodiaceae, 296 

 Polyporaceae, 209, 219 

 Polyporus, 209, 210 

 Polyporus mollis, 92 

 Polyporus sulphureus, 209 

 Pomaceae, 497" 

 Pondweeds, 492 

 Poppy, 496 

 Porella, 237 

 Portulaca, 495 

 Potamogeton, 492 



Potato, 501 



Powdery mildews, 195-198, 217 



Primrose, 498, 500 



Primula, 438 



Primulales, 500 



Procarp, 172, 174, 175 



Progeotropism (pro"ge-ot'ro-pism), 

 126 



Promycelium (pro"my-ce'li-um), 192 



Proterandrous, 441, 442 



Proterandry, 444 



Proterogenous, 441, 442 



Proterogeny, 440 



Prothallium, 265, 287, 288, 291, 292, 

 304, 35 3", 3 2 5> 328, 335. 433. 

 434 



Protoascales, 216 



Protoascomycetes, 216 



Protobasidiomycetes, 218 



Protococcoideae, 158, 621 



Protodiscales, 217 



Protomyces, 216 



Protonema (pro"to-ne'ma), 248, 264 



Protoplasm, 1-12, 42-43, 342; move- 

 ment of, 7-1 1 



Psilotaceae, 296 



Pteridophytes, 295, 434 



Pteris cretica, 346 



Puccinia, 187 



Puff-balls, 220 



Pumpkin, 501 



Purslane, 495 



Pyrenoid, 2, 3 



Pyrenomycetes, 217 



Pyrola, 499 



Pyxidium, 453 



Quercus, 495 

 Quillworts, 289-291 

 Quince, 456 



Raceme, 427 



Radicle, 99 



Ragweed, 502 



Rainy-season flora, 481 



Ranales, 496 



Ranunculaceae, 496 



Raspberry, 454, 455 



Red algae, 171, 628; uses of, 175 



Reproduction, 137, 143, 149, 154, 



155, 179, 185, 186 

 Respiration, 110-116, 117 

 Rhamnales, 498 

 Rhizoids, 24-26 



