TABLE OF CONTENTS. 



INTRODUCTION. 



PAGE 



Books relating to British Freshwater Algae 1 



Occurrence, collection, and preservation of Freshwater Algae . . 3 



Cultivation of Algae ..... 9 



ALG^E. 



Algfe : what they are, and the six classes into which they are divided 10 



Structure of Freshwater Algae 11 



Vegetative multiplication 13 



Asexual reproduction ......... 14 



Sexual reproduction ..... . 15 



Polymorphism .......... 18 



Phylogeny and classification ........ 21 



Class 1. RHODOPHYCE.E, p. 34. 



Order I. NEMALIONACE^E .36 



Family 1. Helminthocladieae 36 



Batraohospermum, Chantransia, Thorea 



Family 2. Lemaneacese 40 



Lemanea, Sacheria 



Order II. CRYPTONEMIACE.E ... 43 



Family 1. Squamariaceae 43 



Hildenbrandtia 



