FROM ALGA TO FERN 367 



TABLE IV. SUBDIVISIONS OF THE PLANT KINGDOM 



1. Thallophyta 



(a) Alga 



(1) Cyanophyceae 



(2) Chlorophyceae 



(3) Phaeophyceae 



(4) Rhodophyceae 



(b) Fungi 



(1) Myxomycetes 



(2) Schizomycetes (bacteria) 



(3) Phycomycetes 



(4) Ascomycetes 



(5) Basidiomycetes 



(6) Fungi imperfecti (life histories imperfectly known). 



(c) Lichens 



2. Bryophyta 

 (a) Hepaticae 

 (6) Musci 



3. Pteridophyta (true ferns) 1 



(a) Eusporangiatae 



(b) Leptosporangiatae 



4. Calamophyta (calamites) 

 (a) Equisetineae 



5. Lepidophyta (lycopods) 



(a) Lycopodineae (club-mosses) 



(6) Lepidodendrineae (little club-mosses) 



1 An older classification combined the last three groups or phyla into 

 one, as follows: 

 3. Pteridophyta (ferns and fern allies) 



(a) Filicineae 



(6) Equisetineae 



(c) Lycopodineae 



