II.— REVISIONS OF SOME PLANT PHYLA 



BY CHARLES E. BESSEY 



In the time that has elapsed since the publication of my 

 " S3'nopsis of Plant Phyla" (University Studies, Vol. VII, 

 No. 4) it has been possible to make many changes in the arrange- 

 ment of the orders and families of several of the phyla. On ac- 

 count of their considerable number it is desirable to present these 

 changes in one paper so as to accomplish the revision of the 

 original paper with as little confusion as possible. 



'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 : 



Approximate No 

 Classes. Orders Families Species 



1. Myxophyceae 2 4 18 2,020 



2. Protophyceae 2 7 16 1,090 



3. Zygophyceae 2 4 21 7,000 



4. Siphonophyceae 3 9 26 1,260 



5. Phaeophyceae 3 5 24 1,030 



6. Rhodophyceae 2 7 24 3,050 



7. Carpomyceteae 3 29 146 64,000 



8. Bryophyta 2 7 65 16,600 



9. Pteridophyta 2 5 13 3,800 



10. Calamophyta 3 3 4 24 



11. Lepidophyta 2 3 7 700 



12. Cycadophyta 4 6 13 140 



13. Strobilophyta i 2 9 400 



14. Anthophyta 2 32 300 132,500 



Total 33 123 686 233,614 



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