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 million recognizable forms. These numerical data 
may be shown concisely in tabular form as follows: 
Classes: Orders Families| Species 
1. Myxophyceae ... 2 4 16 (|About 2,020 
2. Chlorophyceae.. . 2 7 16 |About 1,090 
3. Zygophyceae .... 2 4 21 (|About 7,000 
4. Siphonophyceae . 3 9 26 |About 1,260 
5. Phaeophyceae. .. 3 5 24 |About 1,030 
6. Rhodophyceae .. 2 7 24 |About 3,050 
7. Carpomyceteae. . 3 29 145 |About 64,000 
8. Bryophyta...... 2 7 65 |About 16,600 
9. Pteridophyta.... 2 5 13 |About 3,800 
10. Calamophyta.. .. 3 3 4 |About 24 
11. Lepidophyta..... 2 3 7 (About 700 
12. Cycadophyta.... 4 6 13. |About 140 
13. Strobilophyta.. .. 1 2 9 |About 400 
14. Anthophyta..... 2 32 300 =|About 132,500 
Poth. hag 33 123 683 |About233,614 
