592 



INDEX, PART I. 



Organic acids, 187. 

 Organised ferments, 198. 

 Orthostichy, 13 (Figs. 7, 8). 

 Orthotropic members, 222. 

 Orthotropous ovule, 399 (Fig. 237), 



469 (Fig. 284). 

 Osmosis, 178. 

 Oval, 37. 



Ovary, 57, 395, 465 (Fig. 282). 

 Ovate, 37. 

 Ovule, 52, 396, 424, 468 (Fig. 285). 



anatropous, 399 (Fig. 237), 469 

 (Fig. 284). 



ascending, 469. 



campylotropous, 399 (Fig. 237). 



erect, 469. 



horizontal, 468. 



orthotropous, 399 (Fig. 237), 

 469 (Fig. 284). 



pendulous, 468. 



suspended, 468 (Fig. 284). 

 Oxalate, calcium, 78 (Fig. 51), 81 



(Figs. 57, 53). 

 Oxalic acid, 187. 

 Oxygen, 188, 190, 197. 



absorption of, 197, 200. 



evolution of, 193 (Fig. 128). 



Palea of Composite, 579. 



of Ferns, 364. 



of Grasses, 486. 



Palisade-tissue, 112 (Fig. 92), 172. 

 Palmate, 33 (Fig. 21). 

 Palmatifid, 36 (Fig. 23). 

 Palmitic acid, 187. 

 Palmitin, 187. 

 Panicle, 442. 

 Pappus, 416, 577 (Fig. 393), 579 



(Figs. 396, 397). 

 Paracorolla, 458. 

 Paraheliotropism, 174. 

 Paraphvsis, 269 (Fig. 158), 294, 303, 



(Fig. 183), 335. 

 Parasites, 189, 275. 

 Parastichy, 15. 



Paratonic effect of light, 162, 213. 

 Parenchyma, 90. 



functions of, 163. 

 Paripinnate, 35 (Fig. 23). 

 Partite, 37. 



Passage-cells, 112, 116 (Fig. 96). 

 Pedate, 33 (Fig. 21). 

 Pedicel, 55, 439. 

 Pedicellate, 55. 

 Peduncle, 55. 

 Peloria, 456. 

 Peltate, 33 (Fig. 22). 

 Pentacyclic, 451. 

 Pentamerous, 449. 

 Peptone, 198. 



Perfoliate, 32 (Fig. 20). 

 Perianth, 55, 394, 457. 



-leaves, 57. 175, 443, 458. 

 Periblem, 102 '(Fig. 83). 

 Pericarp, 472 (Figs. 290, 56). 

 Perichsetial leaves, 334. 

 Periclinal, 102. 

 Pericycle, 116, 118 (Figs. 97, 107), 



119. 



Periderm, 150, 151 (Fig. 118). 

 Peridium, 303. 

 Perigynium of Carex, 493. 



of Liverworts, 312 (Fig. 194). 

 Perigynous. 444 (Fig. 261). 

 Perinium, 287, 376. 

 Periodicity of growth, 214. 

 Periplasm, 287. 

 Perisperm, 400, 414 (Fig. 245), 501, 



523, 531. 



Peristome, 338 (Figs. 208-210). 

 Perithecium, 291, 294 (Fig. 176). 

 Permanent tissue, 90. 

 Personate, 455. 

 Petal, 58, 176, 443. 

 Petaloid, 57. 

 Petiole, 29, 32. 

 Petiole-climbers, 175 (Fig. 127), 



212. 



Phelloderm, 150, 154. 

 Phellogen, 150. 

 Phloem, 121, 130. 

 Phosphorescence, 204. 

 Phosphorus, 188, 191. 

 Phototaxis, 214. 

 Phototonic effect of light, 162, 



224. 



Phototonus, 162, 224. 

 Phycocyanin, 238. 

 Phycoerythrin, 71. 238. 

 Phycopbgein, 71, 238. 

 Phycoxanthin, 71. 

 Phylloclade, 28 (Fig. 17). 

 Phyllode, 32. 

 Phyllopodium, 28. 

 Phyllotaxis, 12. 



of flower, 445. 

 Physiology, 1, 157. 

 Pileus, 302 (Figs. 182, 183). 

 Piliferous layer, 109. 

 Pinna, 35. 



Pinnate, 33 (Fig. 21). 

 Pinnule, 35. 

 Pistil, 465. 



Pitcher, 32, 41 (Fig. 28), 175. 

 Pith, 118, 119 (Fig. 97). 

 Pitted wall, 74 (Figs. 45-49). 

 Placenta, 53, 348, 398. 

 Placental scale, 423. 

 Placentation, 468 (Fig. 284). 



axial, 468. 



