734 



INDEX. 



Pleurococcus, 161 



Plum family, 680, 707 



Plumule, 99 



Podostemon, 626, 627, 706 



Poison-hemlock, 708 



Poison -ivy, 707 



Poison-oak, 707 



Poisonous mushrooms, 207, 208 



Poison-sumac, 707 



Pokeweed, 705 



Polemoneales, 694, 710 



Pollen-grain, 299, 305 



Pollination, 303, 304, 420, 430, 433~ 



449. 479 

 Pollinium, 420 

 Polygonales, 705 

 Polygonum, 705 

 Polypodiaceae, 296 

 Polyporaceae, 209, 219 

 Polyporus, 209, 210 

 Polyporus mollis, 90 

 Polyporus sulphureus, 209 

 Pomacese, 680, 706 

 Pond-lilies, 625, 626 

 Pondweeds, 626, 702 

 Poppy, 705 



Populus balsamifera, 592, 594 

 Populus monolifera, 592, 594 

 Populus tremuloides, 602 

 Porella, 237 

 Portulaca, 705 

 Postelsia, 492. 

 Potamogeton, 702 

 Potamogeton natans, 625, 627 

 Potato, 710 



Potentilla fruticosa, 619 

 Powdery mildews, 195-198, 217 

 Prairie formations, 557 

 Prairie societies, 556-560 

 Primrose, 708, 710 

 Primula, 438 

 Primulales, 710 

 Principal formations, 522, 526 

 Procarp, 172, 174, 175 

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



126 



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

 Prosopis juliflora, 560 

 Protection to plants, 471-473 

 Proterandrous, 441, 442 

 Proterandry, 444 

 Proterogenous, 441, 442 

 Proterogeny, 440 

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



34, SOS.S 11 * 3 2 5> 3 28 , 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; 



movement of, 7-11 

 Prunus pumila, 590, 594 

 Prunus virginiana, 68 1 

 Psilotaceae, 296 



Pteridophyta (Pter"id-oph'y-ta), 653 

 Pteridophytes, 295, 434 

 Pteris cretica, 346 

 Puccinia, 187 

 Puff balls, 220 

 Pumpkin, 711 

 Purslane, 705 

 Pyrenoid, 2, 3 

 Pyrenomycetes, 217 

 Pyrola, 709 

 Pyrus malus, 68 1 

 Pyxidium, 453 



Quercus, 669, 704 

 Quercus macrocarpa, 602 

 Quill worts, 289-291, 627 

 Quince, 456 



Raceme, 427 



Radicle, 99 



Ragweed, 711 



Rainfall, 477 



Rainy-season flora, 569 



Ranales, 673, 705 



Range, 497 



Ranunculaceae, 673, 706 



Raspberry, 454, 455 



Red algae, 171, 628; uses of, 175 



Red sage, 572 



Redwood, 538 



Reed-grasses, 625, 626 



Reproduction, 137, 143, 149, 154, 



155, 179, 185, 186 

 Respiration, 110-116, 117 

 Rhamnales, 707, 708 

 Rhizoids, 24-26 

 Rhizome, 354 



Rhizomorph (rhi'zo-morph), 89 

 Rhizophidium, 214, 215 



