If- 



t 



INTRODUCTION 



13 



TABLE I 



CLASSIFICATION OF THE ALGAE SHOWING THE GENERAL FEATURES 



OF THE CLASSES AND THE TAXONOMIC POSITIONS OF THE 



GENERA MENTIONED IN THE TEXT 



Genera marked with an asterisk include colourless species. For 

 further information on classification and morphology see 106, 107, 



259- 



CHLOROPHYTA 



Class 

 Chlorophyceae 

 (green algae; 

 flagellate, coc- 

 coid and fila- 

 mentous forms; 

 more abundant 

 in fresh than in 

 saltwater and 

 tending to be 

 terrestrial) 



Order 



Volvocales 



Chlorococcales 



Ulotrichales 



Cladophorales 



Chaetophorales 



Oedogoniales 



Conjugales 



Siphonales 



Charales 



Genera 



Chlamydomonas, Chloro- 

 gonium, Coccomyxa, 

 Haematococcus, Poly- 

 toma* Polytomella*, 

 Tetrachloris 



A?ikistrodesmus, Chlor- 

 ella, Prototheca* , 

 ScenedesmiiSy Trebouxia 



Enteromorpha, Hor- 



ynidium, Monostroma, 

 Stichococcus, Ulva 



Cladophora 



Oedogonhim 



Zygnema 



Valonia, Vaucheria (?) 



Nitella 



Xanthophyceae . 

 ('yellow-green' 

 algae; flagellate, 

 coccoid and fila- 

 mentous forms; 

 most abundant 

 in freshwater) 



Bacillariophyceae 

 (diatoms; uni- 

 cellular forms; 

 widely distri- 

 buted in fresh- 

 water, marine 

 and terrestrial 

 habitats) 



CHRYSOPHYTA 



Heterochloridales 

 Heterococcales 

 Heterotrichales 

 Heterosiphonales 



Pennales 

 Centrales 



Monodus 

 Tribonema 



Asterionella, Navicula, 

 Nitzschia*, Pinnularia 

 Ditylium 



