254 



INDEX 



Gemmae as propagative 



bodies, 208 

 Grass stems, mechanics of, 



98 



Hsematococcus, 26 

 Halimeda, 61 

 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- 



nosae, 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 



