CHAPTER XXII 

 THE PLANT PHYLA 



WITH THEIR CLASSES, ORDERS, FAMILIES AND IL- 

 LUSTRATIVE GENERA 



The Plant World is here regarded as readily separable into 

 fourteen Phyla (often called ''Branches" or "Divisions"). 

 These are subdivided into Classes, and these again into Orders, 

 and the latter into Families. The latest enumeration of the 

 species of plants shows that we now know approximately a 

 quarter of a milUon recognizable forms. These numerical data 

 may be shown concisely in tabular form as follows: 



Classes Orders Families Species 



1. Myxophyceac . . 



2. Chlorophyceae.. 



3. Zygophyceae . . . 



4. Siphonophyceae 



5. Phaeophyceae. . 



6. Rhodophyceae . 



7. Carpomj'ceteae. 



8. Bryophyta 



9. Pterido])hyta. . . 



10. Calamoi)hyta.. . 



11. Lepidophyta. . .. 



12. Cycadophyta. . . 



13. Strobilophyta... 



14. Anthophyta. . . . 



Total 



33 



123 



About 132,500 



683 About 233,614 



327 



