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. 
i*-!j 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 bieiliate 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 pollenchambers, sperms 
multiciliate. 
Pteridospermae. 
Cycadeae. 
Cordaiteae. 
Ginkgoeae. 
15. Strobilophyta. 400 species. 
Seed plants with nonmotile sperms, with open carpels and 
ovules without pollenchambers, 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. 
