494 The Ohio Naturalist. [Vol. IX, No: 6, 



11. Ptenophyta. 4,500 species. 



Vascular seedless plants with comparatively large multiciliate 

 sperms and usually with large, commonly compound leaves, the 

 sporophylls not in cones. 



Filices. 



Hydropterides. 



Isoeteae. 



12. Calamophyta. 25 species. 



Vascular seedless plants with jointed stems and small whorled 

 leaves, with comparatively large multiciliate sperms, and with 

 the sporophylls in cones. 



Equiseteae. 



Sphenophylleae. 



Calamarieae. 



13. Lepidophyta. 660 species. 



Vascular seedless plants with simple, usually small leaves 

 covering the stem, with small biciliate sperms, and with the 

 sporophylls in cones or sometimes forming zones alternating with 

 the sterile leaves. 



Lycopodieae. 



Selaginelleae. 



14. Cycadophyta. 90 species. 



Seed plants with open carpels permitting the pollengrains to 

 fall into the micropyle, ovules with poUenchambers, sperms 

 multiciliate. 



Pteridospermae. 



Cycadeae. 



Cordaiteae. 



Ginkgoeae. 



15. Strobilophyta. 400 species. 



Seed plants with nonmotile sperms, with open carpels and 

 ovules without poUenchambers, and having the pollengrains 

 falling upon the micropyle. 



Coniferae. 



Gneteae. 



16. Anthophyta. Flowering Plants. 125,000 species. 



Seed plants with closed carpels, with female gametophytes of 

 eight or rarely sixteen cells, with nonmotile sperms, and having 

 the pollen grains fall upon a stigma. 



Monocotylae. 



Dicotvlae. 



