442 



INDEX 



Picea excelsa, 63, 129, 350 ; habit 

 of, 334, 335 (fig-) i leaf of, 

 343- 



Pigments, 60, 64, 150 ; of Bacteria, 

 264 ; of chloroplasts, 109 ; of 

 cork, 137 ; of flowers, 63 ; of 

 Fungi, 231 ; of Hcsmatococcus, 

 1 88 ; of heart-wood, 125, 126 ; 

 of Lichens, 261 ; of Seaweeds, 

 198, 199. 



Piliferous layer, 66, 67 (fig.), 69, 

 72, 77- 



Pimpernel, Yellow (Lysimachia 

 nemorum), stoma of, 160 (fig.). 



Pimpinella anisum, 62. 



Pine, Oregon (Pseudotsuga doug- 

 lasii), 129 ; Pitch (Pinus 

 palustris), 129; Stone (Pinus 

 Pinea), 352 (fig.). 



Pinguicula, glands of , 149, 150 (fig.). 



Pinus, archegonia of, 348, 349 (fig.) ; 

 economic importance of, 63, 

 129 ; embryology of, 350, 351 

 (fig.) ; female cones of, 345 

 (fig.), 346, 347 (fig.) ; fertilisa- 

 tion of, 350 ; habit of, 334, 

 335; leaf-structure of, 152, 166, 

 342-4 (figs.); male cones of, 344, 

 345 (fig-), 347 (fig-) : ovules of, 

 348, 349 (fig.) ; pollen of, 345, 

 347 (fig-), 35i (fig.) ; pollina- 

 tion of, 348, 350 ; seeds of, 

 351, 352 (fig.) ; seedlings of, 

 337, 33 8 (fig-) ; stem-structure 

 of, 338-41 (figs.) ; wood of, 



37 (fig-). 34, 34i (fig-)- 

 Pinus monophylla, 335 ; P. palus- 

 tris, 129, 340 ; P. pinaster, 

 63 ; P. pinea, 352 (fig.) ; P. 

 strobus, 129, 335 ; P. sylvestris, 

 37 (fig-), 129, 152, 166, 334 et 

 seq. (figs.), 391. 

 Piper nigrum, 63. 



Pit, simple, 30 (fig.), 33, 121, 122, 

 276; bordered, 33, 35 (fig.), 

 36, 37, 68, 120, 293, 340, 341 



(fig-)- 



Pit-canals, 33. 



Pit-membrane, 30 (fig.), 36, 126. 



Pitch Pine (Pinus palustris}, 129. 



Pitcher-plant (Nepenthes], glands 

 of, 149. 



Pith of, petiole, 114; root, 69, 70 

 (fig.), 72, 90; stem, 19, 30, 

 43, 45, 76, 77 (fig.), 80 (fig.), 

 172, 173 (fig.), 323, 340. 



Pith-cavity, 80, 81 (fig.). 



Pitted vessels, 35 (fig.), 36, 



Placenta of, Angiosperms, 356, 359, 

 365; Ferns, 295, 296, 298 (fig.). 



Plane (Platanus), bark of, 141 ; 

 hairs of, 102, 103. 



Plankton, 192, 193 (fig.), 207, 210. 



Plantago lanceolata, 367. 



Plants, compared with animals, 

 14, 25, 181, 188, 193, 194, 

 247, 307 ; differences between 

 animals and, 188, 193, 194. 



Plasmatic membrane, 3, 4, 8, 9, n, 

 12, 14. 



Plasmodiophora brassicce, 251, 254 



(fig-)- 



Plasmodium (of Slime-Fungi), 250. 

 Plasmolysis, false, 13, 14, 15 ; 



nature of, 9 ; true, 5 (fig.), 8, 



ii, 15- 



Plasmopora viticola, 243. 

 Plastids, 4, 25, 41, 50, 64. 

 Platy cerium, 309. 

 Plerome, 19, 20, 89, 369. 

 Pleurococcus, i, 190-92 (fig.). 

 Pleurotcsnium, 209 (fig.). 

 Pleurotus ostreatus, Plate II. 

 Plimmer, 54. 

 Plocamium, 204. 

 Plum (Prunus), 93 ; Silver-leaf 



disease of (Stereum purpureum) , 



250, 252. 

 Plumule of, Angiosperms, 369 (fig.), 



370, 371 (fig.), 372 ; Conifers, 



338 (fig.), 350, 351 (fig.) ; 



Cycads, 326. 



Pneumococcus, 263 (fig.). 



Podocarpus, 337. 



Poisonous plants, 48, 60, 61, 255. 



Poisons, and protoplasmic move- 

 ment, 4. 



Polar nuclei (of embryo sac), 357 

 (fig.), 366, 367 (fig.), 368. 



Polarised light and starch-grains, 



43- 



Poles (of nuclear spindle), 23. 



Pollarded trees, 142. 



Pollen mother-cells, 360 (fig.), 361. 



Pollen of, Angiosperms, 356, 361, 

 362 (fig.), 367 (fig.), 373; 

 Conifers, 345, 348, 349, 351 

 (fig.) ; Cycads, 326 ; water- 

 plants, 361. 



Pollen-chamber, of Cycads, 325 

 (fig.), 326; of Lyginopleris, 330, 



331, 332, 333 (fig-)- 

 Pollen-sacs of, Angiosperms, 359, 

 360-63 (figs.) ; Conifers, 345, 

 347 (fig.) ; Cycads, 323, 324 

 (fig-)- 



