5IO 



INDEX. 



Phyllidium, 371 



Phylloclades, 373, 395 



Phyllotaxy, 375, 384 



Physical condition of soil, 465 



Piiysical factors, 465 



Phytolaccace^E, 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, so 



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, 1S3, 215 

 Plectascales, 217 

 Plectobasidiales, 220 

 Pleurococcacete, 161 

 Pleurococcus, i6r 

 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 

 PolUnation, 303, 304, 420, 430, 433- 



449 

 PoUinium, 420 

 Polygonales, 495 

 Polygonum, 495 

 PolypodiaceK, 296 

 Polyporacea;, 209, 219 

 Polyporus, 209, 210 

 Polyporus mollis, 92 

 Polyporus sulphureus, 209 

 Pomaces, 49^ 

 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'Ii-um), 192 

 Proterandrous, 441, 442 

 Proterandry, 444 

 Proterogenous, 441, 442 

 Proterogeny, 440 

 ProthaUium, 265, 287, 288, 291, 202, 



304, 305, 3". 325. 328, 335. 433. 



434 

 Protoascales, 216 

 Protoascomycetes, 216 

 Protobasidiomycetes, 218 

 Protococcoidetc, 11^8, 621 

 Protodiscales, 217 

 Protomyces, 216 



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

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



ment of, 7-1 r 

 Psilotaceje, 296 

 Pteridophytes, 295, 434 

 Pteris cretica, 346 

 Puccinia, 187 

 Puff-balls, 220 

 Pumpkin, 501 

 Purslane, 495 

 Pyrenoid, 2, 3 

 Pyrenomycetes, 217 

 Pyrola, 499 

 Pyxidium, 4^3 



Quercus, 495 

 Quillworts, 289-291 

 Quince, 456 



Raceme, 427 



Radicle, 99 



Ragweed, ^02 



Rainy-season llora, 4S1 



Ranales, 496 



Ranunculacc-E, 496 



Raspberry, 454, 4!;5 



Red alga", 171, OjS; uses of, 175 



Reproduction, 137, 143, 14Q, j^^^. 



155, 170, 1S5, I So 

 Respiration, 110-116, 117 

 Rhamnales, 498 

 Rhizoitls, 24—26 



