CONTENTS 



XI 



Chapter VIII. The Morphology and Physiology of Seeds . 

 § 1. The distinctive characteristics of seeds . 

 § 2. The structure, morphology, and functions of seeds . 

 § 3. The suspension of vitality, resting period, and duration 



of life in seeds . 



§ 4. The germination of seeds 



§ 5. The economics and cultivation of seeds .... 

 § 6. The cycle of development from seed to seed 



PAGB 



372 

 37i 

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377 

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 385 

 386 



PART II 



THE KINDS AND RELATIONSHIPS OF PLANTS 



PAOI 



Chapter IX. The Phylogenetic Classification of Plants . 391 

 Chapter X. Division 1. Thallophyfa : The Thallus Plants 396 



Class 1. Cyanophyceae : the Blue-Green Algae 



Class 2. Schizomycetes : the Bacteria 



Class 3. Flagellata : the Flagellates . 



Class 4. Myxomycetes : the Slime Molds . 



Class 6. Chlorophyceae : the Green Algae . 



Order 1. Protococcales : the Unicellular Green Algae 

 Order 2. Confervales : the Confervoid Algae 

 Order 3. Conjugales : the Conjugating Algae 

 Order 4. Siphonales : the Tubular Algae 

 Order 5. Charales : the Stoneworts 



Class 6. Phycomycetes : the Algal Fungi . 

 Order 1. Saprolegniales s the Water Molds 

 Order 2. Peronosporales : the Blights 

 Order 8. Mucorales : the True Molds . 



Class 7. Phaeophyceae : the Brown Algae . 

 Order 1. Phaeosporales : the Kelps 

 Order 2. Fucales : the Rock weeds 



Class 8. Rhodophyceae : the Red Algae 



Class 9. Ascomycetes : the Sac Fungi 



Order 1. Discomycetes : the Cup Fungi 



Order 2. Pyrenomycetes : the Black Fungi 



Order 3. Erysipheae : the Powdery Mildews 



Order 4. Plectascales : the Blue and Green Molds 



Order 5. Exoasci : the Naked-ascus Fungi 



Order 6. Saccharomycetes : the Yeasts 



Order 7. Lichenes : the Lichens .... 



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