FROM ALGA TO FERN 367 
TABLE IV. SUBDIVISIONS OF THE PLANT KINGDOM 
1. Thallophyta 
(a) Algae 
(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 
(b) Musci 
3. Pteridophyta (true ferns) 1 
(a) Eusporangiatae 
(b) Leptosporangiatae 
4. Calamophyta (calamites) 
(a) Equisetineae 
5. Lepidophyta (lycopods) 
(a) Lycopodineae (club-mosses) 
(b) 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 
(&) Equisetineae 
(c) Lycopodineae 
