INDEX 



571 



306, 307, 535; P. Coulteri, Figs. 298, 



299; P. Halapensis, Fig. 301; P. in- 



signis, Figs. 296, 297, 300, 306; P. 



Lambertiana, 344; P. Pinea, 336; P. 



ponderosa, 344 ; P. sylvestris, Fig. 297 ; 



P. Virginiana, Fig. 286; P. ed, 



Fig. 286. 



Pineapple (Ananas) , 381, 393. 

 Pinguicula, 453, 509. 

 Pinnularia, 22, 87 ; P. viridis, Fig. 13. 

 Piper, 415. 



Piperaceae, 401, 415, 422. 

 Piperales, 413, 414, 415, 424. 

 Piptocephalis, 161; P. Freseniana, Fig. 



125. 



Pistil, 351, 364. 



Pisum, 433; P. sativum, Fig. 424. 

 Pitcher-plant (see also "Darlingtonia," 



"Nepenthes," " Sarracenia ") , 7, 26, 



362, 424, 431, 478, 508. 

 Pith, 255. 



Pithophora, 106, 116 ; P. cedogonia, Fig. 76. 

 Pittosporaceae, 444. 

 Placenta, 284, 339. 

 Plankton, 84, 88, 497. 

 Planktoniella, 88, 497, Figs. 62, 465. 

 Planogametes, 93. 

 Plantaginacese, 453, 459. 

 Plantaginales, 449, 453, 459. 

 Plantago : P. major, 453. 

 Plantain (Musa) , 395. 

 Plantain (Plantago), 364, 366, 516, Fig. 



328. 



Plant-body, 12. 

 Plant diseases, 150. 

 Plants and animals compared, 6. 

 Plasmodiophora Brassicse, 71. 

 Plasmodium, 12, 68, 69, 461, 491. 

 Plasmolysis, 45. 

 Plasmopora, 157, 158; P. viticola, Fig. 



121. 



Plastic substances, 461. 

 Plastids (see also " Chromatophores "), 



35, 36, 38, 44, 45, 46, 48. 

 Plastine, 39. 

 Platanaceae, 444. 

 Platanus, 431, 432, 537; P. occidentalis, 



Fig. 421. 



Platycerium, 273. 

 Platystemon, 429. 

 Plectascineae, 169. 

 Pleiochasium, 367. 

 Pleodorina, 94, 95, 97; P. Calif ornica, 



Figs. 65, 66. 

 Pleospora, 172. 

 Plerome, 360. 



Pleurocarpous Mosses, 240. 

 Pleurococcacese, 100, 101. 



Pjleurococcus, 98, 99, 496; P. vulgaris, 



Fig. 68. 



Pleurozioidiese, 219. 

 Pliocene formations, 538. 

 Plowrightia, 172, 173; P. morbosa, Fig. 



139. 



Plum, 172, 360, 368. 

 Plumbago, Plumbaginaceae, 450, 451, 458 ; 



P. capensis, 451. 

 Plumule, 401. 



Plurilocular sporangia, 129. 

 Podocarpus, 343. 

 Podophyllum: P. peltatum, 62, 401, 406, 



408, 425, 427, Figs. 44, 387, 413. 

 Podostemon, 431: P. olivaceum, Fig. 419. 

 Podostemonaceae, 361, 404, 431, 444. 

 Podostemonineae, 444. 

 Pogonia, 25; P. ophioalossoides, Fig. 17. 

 Poison-ivy (Rhus toxicodendron) , 363. 

 Poisonous Fungi, 185. 

 Polar nuclei, 355, 358. 

 Polemoniaceae, 453. 

 Pollen-sac, 22, 27, 328, 338, 353. 

 Pollen-spore, 27, 51, 64, 323, 325, 329, 338, 



352, 353, 511. 



Pollen-tube, 323, 325, 348, 357, 487. 

 Pollination, 356, 357, 370, 514. 

 Pollinium, 523. 



Polyedrium (Hydrodictyon) , 100. 

 Polygala, Polygalacese, 436, 445. 

 Polygalinese, 445. 

 Polygonaceae, 421, 422. 

 Polygonales, 413, 414, 421. 

 Polygonum, 422, 424; Fig. 407. 

 Polymorphy in Rusts, 176. 

 Polyphagus, 152, 153; P. Euylense, Fig. 



117. 

 Polypodiacese, 249, 264, 273, 276, 278, 279, 



28ft; fossil P., 532. 

 Polypodium : P. falcatum, 258, 280, Figs. 



223, 227, 228, 247, 262, 263, 280. 

 Polyporacese, 181. 

 Polyporus, 181. 

 Polysiphonia, 16, 138, 142, 143, 144, 482, 



Figs. Ill, 112, 113; P. Woodii, Fig. 6. 

 Polystelic stem, 255. 

 Polytrichaceae, 240. 

 Polytrichum, 201, 228, 231, 235, Fig. 199; 



P. commune, Fig. 191. 

 Pomaceae, 433. 

 Pomegranate (Punica). 441. 

 Pond-scums (see " Zygnemaceae ") 

 Pond-weed, 7, 369, 376. 

 Pontederia. 392, 393, 394,525 ; P. cordata, 



392, 525, Fig. 370. 

 Pontederiaceae, 392. 

 Poplar, Populus, 413, 514, 527, 539, 545; 



P. balsamifera, Fig. 473. 



