INDEX 
Micropyle, 183, 261. 
Microsphaera, 75, 76. 
Microsporangium, 134, 135, 139, 172, 173, 
174, 177, 184, 189, 205, 220, 257, 258, 259. 
Microspore, 135, 175. 
Microsporocarp, ///, 172, 173, 174. 
Microsporophyll, 135, 195, 214, 220, 257. 
Middle layers, anthers, 257. 
Mildews, 75, 76. 
Mimosa, leaf, 452. 
Miscible, 303. 
Monadelphous stamens, 255. 
Monoblepharis, 64. 
Monocotyledons, classification, 276 ; em- 
bryo, 273, 274, 275; vascular system, 244, 
245, 246. 
Monosiphonous, algae, 45. 
Moonwort, 149, 150. 
Morchella, 71. 
Morel, 71. 
Morphin, 415. 
Morphogenic stimuli, 435. 
Morphology, i, 295. 
Mosses, no. 
Mother cell, 127. 
Motor organs, 451. 
Movement, 417 ; amoeboid, 444; autono- 
mic, 453; of cell organs, 450; ciliary, 445, 
446; contact, 452, 454; excretory, 445; 
gravity, 455 ; growth, 457 ; leaf, 455, 456; 
nyctitropic, 456; paratonic, 454 ; photeo- 
lic, 455, 456; turgor, 451, 457. 
Mucilage, blue-green algae, 6. 
Mucor, 67, 68, 69, 435. 
Mucorales, 67. 
Muscarin, 415. 
Musci, no. 
Mushrooms, 87. 
Mutation, 288. 
Mutualism, 382. 
Mycelium, 61. 
Mycetozoa, 2. 
Mycorhiza, 74, 382, 383. 
Myriophyllum, stem section, 320. 
Myxobacteriaceae, 14. 
Narcotin, 415. 
Nastic movements, 431. 
Nasties, 432. 
Natural selection, 285. 
Nectary, 339. 
Nemalion, 56. 
Neottia, mycorhiza, 383. 
Nepenthes, leaf, 385. 
Nephrodium, sperm, 444. 
Nereocystis, 47, 48. 
Nest fungi, 90. 
Nicotiana, flower, 253. 
Nicotin, 415. 
Nidulariales, 90. 
Nitella, 42. 
Nitrogen, source of, 378. 
Nodes, 41, 145. 
Nostoc, 7, 8. 
Notothylas, 106, 108. 
Nucellus, 183. 
Nucleus, 6, 15, 1 6, 297. 
Nutation, 423, 424. 
Nutrition, 356. 
Nutritive mechanism, in ovule, 266. 
Oedogonium, 27, 29, 30. 
Oil receptacle, 340. 
Oils, essential, 413. 
Ontogeny, 295. 
Oogonium, 27, 28, 30, 31, 36. 
Oomycetes, 62. 
Ooplasm, 66. 
Oosphere, 17. 
Oospore, 18. 
Operculum, 113, 114, 119, 120. 
Ophioglossales, 149 ; conclusions, 154. 
Ophioglossum, 149 ; habit, 150; sporangium 
152, 153- 
Orchidales, 278. 
Organ, 297. 
Organized bodies, structures, 300. 
Organogeny, flowers, 256. 
Orthogenesis, 289. 
Orthotropic organs, 459. 
Orthotropous ovules, 261. 
Oscillatoria, 6, 7. 
Osmosis, 302, 305. 
Osmotic pressure, 309. 
Osmunda, sporangium, 156; stele, 162. 
Osmundaceae, 155. 
Outgo, material, 323. 
Ovary, 260. 
Ovule, 183; angiosperms, 260, 261; gym- 
nosperms, 196, 197, 198, 205, 206, 209, 210, 
213, 214, 221, 222, 232, 233, 234. 
Oxalic acid, 414. 
Palisade, leaf, 250, 251, 319. 
Palmales, 277. 
Palmella, 26. 
Pandanales, 276. 
Pandorina, 17. 
Panicum, coleoptile, 465. 
Panmixia, 291 . 
Pappus, 282. 
Parallelotropic organs, 458, 460. 
Paraphyses, 50, 51, 117. 
Parasite, 61, 381 ; injury by, 383. 
Parasitism, 381. 
Paratonic movements, 454. 
G 
