BOTANICAL CLASSIFICATION OF ALGAE 



From British Fresh-water Algae by W est and Fritsch 



Class 1. Isokontae. With grass-green chlorophyll and true starch. 

 The "Phytomonadida" of protozoa are included here together 

 with the desmids (conjugatae) and many filamentous algae. 



Class 2. Heterokontae. Also with yellow-green chlorophyll; a small 

 group not separately recognized in classification of protozoa. 



Class 3. Chrysophyceae. Includes types with yellow, orange, or 

 brown chlorophyll. The Chrysomonadida of protozoa are in- 

 cluded here together with higher types of filamentous algae. 



Class 4. Bacillariales. Diatoms, with yellow, green, or brown 

 chlorophyll. No motile organs and not recently included with 

 protozoa. 



Class 5. Cryptophyceae. With diverse chlorophyll but commonly 

 brown. Included as Cryptomonadida in protozoa. No fila- 

 mentous forms. 



Class 6. Dinophyceae. Chlorophyll when present, yellow, brown or 

 green; with characteristic cell furrows. Included among 

 protozoa as "Dinoflagellida." Except the genus Haplozoon 

 (Fig. 24), no filamentous forms. 



Class 7. Chloromonadales. A small group with yellow or green 

 chlorophyll and characteristic structure. Included in protozoa 

 as an Order "Chloromonadida." 



Class 8. Euglenineae. With green to red chlorophyll and formation 

 of paramylum instead of starch. In protozoa the Order 

 "Euglenida." 



Class 9. Pheophyceae. Filamentous brown algae. Not included in 

 protozoa. 



Class 10. Rhodophyceae. Filamentous red to blue sea-weeds. Never 

 included as protozoa. 



Class 11. Myxophyceae. Blue-green Algae, never included as protozoa. 



49 



