CONTENTS 



xv 



D. Dry and fleshy fruits 



E. Inflorescence fruits 



F. Self-planting fruits . 



G. Seedless fruits 

 Section 67. The nature of seeds 



A. The importance of seeds to mankind 



B. The importance of seeds to plants 



C. Protection of and by seeds 



D. Vitality of seeds 



E. Structure of seeds .... 



F. Cotyledons and the divisions of seed plants 



G. Seeds and foods 

 H. Germination of seeds 



Section 68. Agencies of seed dispersal 



A. Wind 



B. Water . 



C. Animals 



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CHAPTER NINE: THE NON-VASCULAR PLANTS 



Section 69. 

 Section 70. 



Thallophytes 

 Section 71. Alga? 



Introductory . 



The four great divisions 



A. Unicellular forms . 



B. Colonial forms 



C. Many-celled fresh-water forms 



D. The groups of algae 

 Section 72. Fungi ...._. 



A. Parasites and saprophytes 



B. Economic importance 



C. Bacteria . 



D. True fungi 



E. Fungi and the soil . 



F. Lichens 



Bryophytes : 

 Section 73. Liverworts 



A. Reproduction . r . 



B. Alternation of generations 



C. Leafy liverworts 



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