CONTENTS. 



4. The Distribution of Species. 



Page 



The Distribution of Species by Offshoots, - 790 

 The Dispersion of Species by means of Fruits 



and Seeds, 833 



Limits of Distribution, 



Plant Communities and Floras, - 



Page 



- 87» 



- 885 



5. The Extinction of Species, - - 899 



CLASSIFICATION OF PLANTS. 



Phylum 1. — Myxothallophtta. 



Alliance 1. — Myxomycetes, - - - 618 



Phylum 2. — Thallophyta, 



Class I. - Schizophyta, ... - 320 

 Alliance 2. — Cyaiiophycea;, the Blue-green 



AlgiB, ------- 621 



Alliance 3. — Schizomycetes, the Bac- 

 teria, ------- 622 



Class II. — Dinoflagellata, Peridinese, - - 625 



Alliance 4, ----- - 625 



Class III. — Bacillariales, - - - . 625 



Alliance 5, - - - ... 625 



Class IV. — Gamophycese, - - - . 627 



Sub-class I. — Chlorophyceae, the Green 



Algse, 627 



Alliance 6. — Protococcoidese, - - - 628 



Do. 7. — SiphoneEe, - - . - 641 



Do. 8. — Confervoidese, - - - 648 



Do. 9. — ConjugatEe, - - - - 654 



Do. 10.— Charales, - - - - 659 



Do. 11. — Phseophycese, - - - 661 



Do. 12.— Dictyotales, - - - 666 



Do. 13.— Floridea;, Eed Sea-weeds, - 666 



Class V.— Fungi, 668 



Sub-class I. — Phycomycetes, - - - 668 



Alliance 14. — Oomycetes, - - - 668 



Do. 15. — Zygomycetes, - - - 673 



Sub-class II. — Mesomycetes, - - - 674 



Alliance 16, 674 



Do. 17, - - - - - - 674 



Sub-class III. — Mycomycetes, - - - 676 



Alliance 18, - - - - - - 676 



Do. 19, 684 



Additional Group of Fungi, Lichenes, - 691 



Phylum 3. — Archegoniat^. 



Class I. — Bryophyta, 696 



Alliance 20. — Hepaticse, Liverworts, - 696 



Do. 21. — Musci, Mosses, - - - 699 



Class II. — Pteridophyta, Vascular Crypto- 

 gams, 704 



Alliance 22. — Filices, Ferns, - - - 705 

 Do. 23. — Hydropterides, Rhizocarps, 709 

 Do. 24. — Equiaetales, Horsetails, - 711 

 Do. 25. — Lycopodiales, Club-mosses, 713 



Phylum 4. — Phanerogamia, Flowbring 

 Plants.. 



