488 



INDEX 



Oogonium, 221-228, 230, 237, 238, 



255- 



Oosphere, 228. 

 Oospore, 219, 222, 224. 

 Ophioglossales, 351. 

 Ophioglossum, 351. 

 Oranges, 412. 

 Orchid family, 166. 

 Orchidaceae, 166. 

 Orchids, velamen of roots, 28. 

 Orchil, 275. 



Organic compounds, 117. 

 Origin of species, 459. 

 Oryza sativa, 396. 

 Oscillatoria, 233, 245. 

 Osmic acid, 19. 

 Osmosis, 48. 



Osmunda cinnamomea, 340. 

 Osmunda claytoniana, 340. 

 Osmunda regalis, 340. 

 Ostrich fern, 340. 

 Otthia morbosa, 266. 

 Ovary, 143, 184, 187, 375, 542. 

 Ovule, 143, 183, 184, 361, 375. 

 Ovule case, 375. 

 Ovule, integuments of, 185, 187, 



363- 



Oxycoccus macrocarpus, 416. 

 Oxy coccus oxy coccus, 416. 

 Oxydendrum arboreum, 415. 

 Oxygen, 15, 98-105, 116. 



Palea, 159, 162. 



Palm family, 399. 



Palmaceae, 399. 



Pandanus, 81. 



Pandorina morum, 221, 229. 



Papilionaceae, 152, 409. 



Parasites, 126-139, 246, 439. 



Parasites, nutrition of, 127. 



Parasitic fungi, nutrition of, 129. 



Parenchyma, 31, 53, 54, 59, 85. 



Parmelia, 271. 



Parsnip, 26, 43. 



Parthenogenesis, 256. 



Pea, 7, n, 18. 



Pea family, 409. 



Pea leaf, 74. 



Pea, sweet. 150-152. 



Peach, buds and shoots of, 66, 67. 



Peach, fruit, 192, 407. 



Peanuts, 409, 410. 



Pears, 195, 406, 407. 



Peat mosses, 322-324. 



Peltigera, 271. 



Pepo, 195, 196. 



Perennial stems, structure of, c*. 



n s * OO) 



58-60. 



Perennials, 37. 

 Perianth, 165, 166, 375. 

 Pericarp, 188, 192, 195. 

 Pericycle, 31. 

 Periplasm, 258. 

 Perisperm, 185, 186, 385. 

 Perisporiales, 262. 

 Perithecium, 261-266. 

 Peronospora alsinearum, 258, 259. 

 Peronospora calotheca, 257. 

 Peronospora schleideniana, 258. 

 Petal, 143. 

 Petiole of leaf, 70. 

 Peziza, 266. 



Phaeophyceae, 209, 235-239. 

 Phallin, 296. 

 Philotria, 98. 

 Phloem, 31, 54-58. 

 Phoenix dactylifera, 399. 

 Phoradendron flavescens, 128. 

 Phosphate rock, 119. 

 Phosphates, 118. 

 Phosphorus, 15, 117. 

 Photosynthesis, 85, 90, 97-105, 116. 

 Phragmidium violaceum, 282. 

 Phycomyces nitens, 253. 

 Phycomycetes, 209, 247, 300. 

 Phyllitis scolopendrium, 328. 

 Phylloclades, 46. 

 Phyllotaxy, 68, 69, 76, 77. 

 Physcia stellaris, 271, 272. 

 Physical factors, 422. 

 Phytomyxa leguminosarum, 121. 

 Picea, cones of, 357. 

 Pileus, 293. 

 Finales, 35 7. 

 Pine leaves, 75. 

 Pine, life history of, 360. 

 Pine seed, 10, 364, 366. 

 Pine seedling, 10, 103. 

 Pineapple family, 401. 

 Pinus sylvestris, structure of wood, 



358. 



Piper nigrum, seed of, 185. 

 Pirus, 407. 

 Pistils, 143, 147, 150, 151, J 55, 162, 



166, 379. 



Pitcher plant, 88, 89. 

 Pith, 57, 59- 

 Pits, bordered, 358, 360. 



