THE CLASSIFICATION OF PLANTS 



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2. 



3- 

 4- 



5- 



4. Heterotrichales 



5. Heterococcales 



6. Heterosiphonales 

 '^. Chrysophyceae 



I. Chrysomonadales 

 Rhizochrysidales 

 Chrysocapsales 

 Chrysotrichales 

 Chrysosphaeriales 

 y. Bacillariophyceae 



1. Centrales 



2. Pennales 



V. Phaeophyta 



a. Isogeneratae 



Ectocarpales 



Sphacelariales 



Tilopteridales 



Cutleriales 



Dictyotales 



p, Hetercgeneratae 

 (i) Haplostichineae 



1. Chordariales 



2. Sporochnales 



3. Desmarestiales 



(ii) Polystichineae 



1. Punctariales 



2. Dictyosiphonales 



3. Laminariales 

 y. Cyclosporeae 



I. Fucales 



VI. Cyanophyceae 



a. Myxophyceae 



1. Chroococcales 



2. Chamaesiphonales 



3. Hormogonales 



VII. Rhodophyta 

 'J.. Rhodophyceae 

 (i) Banginideae 



I. Bangiales 

 (ii) Florideae 



1. Nemalionales 



2. Gelidiales 



3. Cryptonemiales 



4. Gigartinales 



5. Rhodymeniales 



6. Ceramiales 



The latest and by far the most comprehensive and authoritative account 

 of the Algae is that published by Fritsch. In a revision of West's " British 

 Freshwater Algae", published in 1927, Fritsch gave some indication 

 of the new ideas on classification which he was maturing, but it 

 was not until 1935, when the first volume of his large work on " The 

 Structure and Reproduction of Algae " appeared, that the import of these 

 new ideas could be appreciated. The first volume deals mainly with the 

 Green Algae while the second, which appeared ten years later, covers the 

 Brown and Red Seaweeds. 



It is not possible here to give more than a summary of this elaborate 

 classification and students should consult the original work for a fuller 

 treatment of the subject. 



I. Chlorophyceae (Isokontae) 



1 . Volvocales 



2. Chlorococcales 

 Ulotrichales 

 Cladophorales 

 Chaetophorales 

 Oedogoniales 

 Conjugales 



3- 



4- 



5- 

 6. 



7- 



