688 



BOTANY OF THE LIVING PLANT 



232 



Phalaenopsis, mycorrhiza in, 

 (Fig. 159). 



Pharbitis, sinistrorse twining stem of, 

 215 (Fig. 144). 



Phaseolus vulgaris (French or Haricot 

 Bean), analysis of, 655 ; origin of, 

 656. 



Pheasant's Eye, 609. 



Phelloderm, the inner product of 

 cork-cambium, 66 (Figs. 43, 44). 



Phellogen, the cambium that pro- 

 duces cork, 66 (Figs. 43, 44). 



Phenotype, of an individual, the 

 aggregate of its visible or demon- 

 strable personal characters : also 

 an individual with a given aggre- 

 gate of such characters, 575. 



Phloem, the bast-region of the vas- 

 cular strand, 45, 48 (Figs. 23, 24, 

 25) ; of Fern, 488 (Figs. 377, 378). 



Phloem parenchyma, 49 (Fig. 26), 59 

 (Fig. 38). 



Phlox, 140. 



Phoma, in mycorrhiza, 230. 



Phormium, leaf structure of, 187 (Fig. 

 120). 



Phosphorus, necessary to form pro- 

 teins, 126 ; supply of, no. 



Photosynthesis, construction of new 

 organic material under the influ- 

 ence of light in green parts : 114 ; 

 localised, 117 (Fig. 78) ; evolution 

 of oxygen, 120 (Fig. 80) ; chemistry 

 of, 121 ; rate of, 122 ; products of, 

 122 ; and energy, 138 ; activity of, 

 on a summer's day, 122 ; by Sul- 

 phur Bacteria, 451. 



Phototropism, 158 (Fig. 97) ; positive 

 and negative, 158-159. 



Phragmidium, 438 (Fig. 338). 



Phycomyces, 413, 414, 416. 



Phycomycetes, 392, Chap. xxv. ; sub- 

 aerial adaptation of, 447. 



Phyllanthus, 628. 



Phylloclades of Ruscus, 345 (Fig. 



259). 



Phylloglossum, 512. 



Phyllosiphon, 393, 411. 



Physiological drought, a deficiency of 

 water due to inability of the plant 

 to absorb enough to replace loss, 

 not to a want of water outside it, 

 211. 



Phytophthora infestans (Potato Fun- 

 gus), 399. 401. 4° 6 ( Fi g s - 3°5-3°9) ; 

 sexual reproduction in, 410. 



Pileus, domed head of Mushroom, 

 444. 



Piliferous layer, the superficial layer 

 of the root, which bears the root- 



hairs, 83 (Fig. 57) ; origin of, 88, 

 89 (Figs. 63, 64). 

 Pilobolus, explosive dispersal of, 



415- 



Pinguicula (Butterwort), carnivorous 

 habit of, 164, 239. 



Pinnule, 349. 



Pinus, Chap, xxxiii., p. 527 ; cam- 

 bium of, 57 (Fig. 35). 



Pinus montana, male flower of, 534 

 (Fig. 421). 



Pinus nigra, male flowers, 528 (Fig. 

 420) ; female flowers, 539 (Fig. 

 416). 



Piptocephalis, parasitism of, 414 ; 

 air dissemination of, 447. 



Pistil, an old term for the gynoecium, 

 or carpellary region of the flower, 

 255, 288. 



Pistillate, applied to flowers or plants 

 which bear carpels, but not 

 stamens, 256 ; by abortion in 

 Lychnis, 270 (Fig. 194). 



Pisum sativum (Garden Pea), recep- 

 tive cells in root, 156 (Fig. 95) ; 

 used in Mendel's experiments, 570 ; 

 analysis of, 655. 



Pit, an area of cell-wall that remains 

 thin, 24 (Figs. 14, 15, 16). 



Pitcher Plant (Nepenthes). 240 (Fig. 

 167). 



Pith, 42 (Fig. 21), 44 (Fig. 24). 



Placenta, the surface of insertion of 

 the ovule or ovules, 291 ; free- 

 central, 621, 640 (Figs. 470, 472). 



Placentation, the mode of insertion 

 of the ovules, 291. 



Plagiotropism, 154. 



Plankton, floating organic life, 375. 



Plantago, haustoria of embryo-sac, 



317- 

 Plant cell, an osmotic system, 35. 



Plant communities, plants of a local- 

 ity subjected to and adapted for 

 life under common conditions, 188. 



Plant population, 312. 



Plants and animals, 138. 



Plasmatic membrane, 34-35. 



Plasmodiophora, 396 (Fig. 295). 



Plasmolysis, separation of the proto- 

 plast from the cell-wall, by its 

 contraction, due to loss of water, 

 36 (Figs. 18, 19). 



Plastids, minute bodies in the cyto- 

 plasm, which multiply by fusion, 

 and give rise to chloroplasts, 

 chromoplasts, or leucoplasts : 18 



(Fig. 9)- 

 Platycerium, 598. 

 Plectascales, 421. 



