FRESH-WATER ALGJE. 



MARINE Algae are conventionally classified into four primary 

 divisions, the BED, the OLIVE, the GREEN, and the BLUE. Tech- 

 nically they are known as the BHODOPHYCE^E, the MELANOPHY- 

 CE^:, the CHLOROPHYCE^: and the CYANOPHYCE^;. 



The arrangement proposed for the classification of onr Fresh- 

 water Algae is in the same order in as far as it may be adapted. 

 The MELANOPHYCE^E are not represented. Having disposed of 

 the DESMIDIE.E, as supplemental to a previous volume, the DES- 

 MIDS or THE UNITED STATES, we commence with the BED 

 fresh-water plants; they are most nearly related to the more 

 highly developed forms, the Marine plants ; from these we de- 

 scend to the lower and lowest forms. The inductive system 

 does not apply, because so many of the hitherto recognized sim- 

 pler unicellular forms are not established factors they are not 

 well understood, and indeed have no value except as conditions 

 of plant-life. 



The following is an outline of the order of arrangement ad- 

 hered to in the following pages. 



CLASS I. BHODOPHYCE^. 



ORDER I. FLOBIDI^E. 



\ 



FAMILY I. Lemaneacese. 



Genus 1. Lemanea. 

 " 2. Tuomeya. 



FAMILY II. Porphyracese. 

 Genus 3. Bangia. 



FAMILY III. Batrachospermacese. 



Genus 4. Batrachospermum. 

 5. Thorea. 

 6. Chantransia. 



FAMILY IV. Hildebrandtiacese. 



Genus 7. Hildebrandtia. 

 " 8. Coinpsopogon. 



