254 INDEX 
Gemmz_ as 
bodies, 208 
Grass stems, mechanics of, 
98 
propagative 
Heematococcus, 26 
Halimeda, 51 
Hydrurus, 40 
Hygrophyte, 138 
Immunity, 177 
Laminaria, 48 
Leaf-fall, 136 
Leaf, function of, 61 
Leaves, mechanical tissues 
of, 123 
Leaves, physiological replace- 
ment of, 139 
Lichens, 199 
Lithophyte, 133 
Loranthus, a flowering para- 
site, 184 
Mangrove plants, 120 
Mechanical tissues, 90 
Mechanical tissues of climb- 
ing plants, 109 
Mechanical tissues of roots, 
103 
Meiosis, 233 
Mesophyte, 138 
Mistletoe, 182 
Mycorhiza, 192 
Nuclear division, 227 
Nucleus of the cell, 17, 226 
Organisation, 58 
Ovule of flowering plants, 
244 
Parasites, 165 
Parasitism, stages in, 185 
Peltigera canina, 201 
Photosynthesis, 23 
Physiological drought, 133 
Pleurococcus, 19 
Pollen, 244 
Prasiola, 38 
Prothallus of fern, 226, 237 
Rafflesia Arnoldii, a flowering 
parasite, 187 
Reproduction, 204 
Root pressure, 85 
Root, structure of, 72 
Root tubercles of Legumi- 
nos, 194 
Roots assuming function of 
leaves, 140 
Roots, mechanical tissues of, 
103 
Rust-fungi, 180 
Saprophytes, 165 
Sclerenchyma, 94 
Sea-lettuce, 36 
Sexual reproduction, 212 
Smut infesting campion, 173 
Soil, absorption of water 
from the, 79 
Spectrum of chlorophyll, 25 
Spirogyra, 43 
Sporangia, 236 
Starch in leaves, 67, 69 
Stoma, 64 
Stress, effects of, 129 
Symbiosis, of lichens, 200 
Syncytium, 21 
Thickening of stems, 101 
Tillandsia usneoides, 155 
Timber trees, growth of, 87 
Tracheids, 76 
Transpiration, 70, 136 
Ulva, 36 
