INDEX 
Income, material, 297. 
Indusium, 156, 157, 163, 165, 172, 175, 177. 
Injury, 440 ; mechanical, 482. 
Insectivorous plants, 386. 
Integument, 183, 196, 205, 209, 2/0, 213, 
214, 230, 232, 233, 261, 280. 
Intcrnodes, 41, 145. 
Inline, 147, 258. 
Inulase, 400. 
Inulin, 391. 
Invertase, 400. 
Involucre, 280. 
Irregularity, flowers, 256, 278, 280, 282. 
Irritability, 426 ; loss of, 434. 
Isocarpic flowers, 281. 
Isoetes, embryo, 141; gametophytes, 140; 
habit, 138; sporangia, 139. 
Isogamy, 16. 
Isolation, 292. 
Jungermanniales, 101 ; contrast with Mar- 
chantiales, 105. 
Laboulbeniales, 77. 
Lactic fermentation, 410. 
Lactuca, root hairs, 312. 
Lagenostoma, 182. 
Laminuriaceae, 47. 
Laminaria, 46. 
Latex system, 396. 
Leaf, angiosperms, 250, 251; fall of, 354; 
gaps, 159 ; gymnosperms, IQO, IQI, IQ2, 
1 93, 203, 204, 207, 208, 220, 229; liver- 
worts, 101, 104; mosses, in, 112, 116; 
pteridophytes, 122, 133, 138, 150, 151, 
15^, 163, 164, 171, 176; traces, 125, 192, 
IQ4. 
Leafy liverworts, 101. 
Lecithins, 360. 
Leguminosae, 280 ; relation to nitrogen, 379. 
Lenticel, 240, 241. 
Leptosporangiates, 162. 
Lessonia, 48. 
Leucoplast, 389. 
Lichens, 78, 91. 
Life, 408. 
Light, exposure to, 370; and form, 437; 
and growth, 435; and nastic curvatures, 
443 ; photosynthesis, 368; position, 478 ; 
source of, 372. 
Ligulatae, 132. 
Ligule, Lycopodiales, 132, 134, 137, 139, 141. 
Liliales, 278. 
Lily, anther section, 250; leaf epidermis, 
251 ; leaf section, 250, 319. 
Liquids, 302. 
Liverworts, 93. 
Locomotion, m, 
Lycoperdales, 90. 
Lycoperdon, 90. 
Lycopodiaceae, conclusions, 132. 
Lycopodiales, 122. 
Lycopodium, 122 ; antheridium, 129; arche- 
gonium, 130; embryo, 131; gametophyte, 
127, 128, IZQ; habit, 123, 134; sporan- 
gium, 725, 126; stele, 125. 
Lyginodendron, stem section, 182. 
Lygodium, sporangium, 157. 
Lyngbya, 6. 
Macrocystis, habit, 47. 
Malic acid, 414. 
Maltase, 400. 
Manubrium, 43. 
Maple sap, 334. 
Marattia, embryo, 169; habit, 158; leaflet, 
164. 
Marattiaceae, 155; antheridium, 166; spo- 
rangia, 1 60. 
Marchantia, 98, 99, 100, 435. 
Marchantiaceae, 97. 
Marchantiales, 93 ; contrast with Junger- 
manniales, 105. 
Marsilea, female gametophyte, 179; habit, 
176; male gametophyte, 178; sporocarp, 
177. 
Marsileaceae, 176. 
Massulae, water ferns, 173, 775. 
Material income, 297. 
Material outgo, 323. 
Mechanical stimuli, 439. 
Medulla, kelps, 48. 
Medullosa, 182. 
Megaceros, 106. 
Megasporangium, 134, 135, /jp, 172, 173, 
174, 177, 261, 262, 263. 
Megaspore, 135, 172, 196, 262. 
Megasporocarp, 171, 172. 
Megasporophyll, 135, 197. 
Members, 297. 
Membrane, cell wall, 306 ; cytoplasmic, 
306 ; impermeable, 305 ; permeable, 305. 
Mendel's law, 292. 
Merismopedia, 6. 
Meristem, 133 ; primary, 419 ; secondary, 
419. 
Mesarch, 157. 
Mesembryanthemum, origin of lateral root, 
420. 
Mesocarpaceae, 38. 
Mesophyll, 250. 
Metabolism, 402 ; destructive, 403. 
Metaxylem, 157, 241. 
Micellae, 300. 
Microcycas, 201. 
Microorganisms, 400. 
