Mar., 1922 classification of plants 139 



Phylum X. Ptenophyta. Femworts. 

 Class 35. Filices. Ferns. 

 Subclasses. 



a. Eusporangiatae. Primitive Ferns. 



b. Leptosporangiatae. Modem Ferns. 

 Class 36. Hydropteridae. Water-ferns. 

 Class 37. Isoeteae. Quillworts. 



Phylum XI. Calamophyt,\. Calamite Plants. 



Class 38. Sphenophylleae. (Fossil). Wedge-leaf Calamites. 



Class 39. Equiseteae. Horsetails. 



Class 40. Calamariae. (Fossil). Calamites. 



Phylum XII. Lepidophyta. Scale-leaf Plants. 

 Class 41. Lycopodieae. Lycopods. 

 Class 42. Selaginelleas. Selaginellas. 



Phylum XIII. Cycadophyta. Cycad Plants. 



Class 43. Pteridospermae (Fossil). Seed Ferns. 

 Class 44. Cycadeae. Cycads. 

 Class 45. Cordaiteae (Fossil). Cordaites. 

 Class 46. Ginkgoae. Maiden-hair-trees. 



Phylum XIV. Strobilophyta. Strobilus Plants. 

 Class 47. Coniferae. Conifers. 

 Class 48. Gneteae. Joint-firs. 



Phylum XV. Anthophyta. Flowering Plants. 

 Class 49. Monocotylae. Monocotyls. 

 Subclasses. 



a. Helobiae. 



b. Spadiciflors. 



c. Glumifiorae. 



d. Liliifiorae. 



Class 50. Dicotylae. Dicotyls. 

 Subclasses. 



a. Thalamiflorae. 



b. Centrospermae. 



c. Calyciflorae. 



d. Amentiferae. 



e. Myrtiflorae. 



f. Heteromerae. 



g. Tubiflorae. 

 h. Inferae. 



