Proceedings of the Ohio State Academy of Science. 279 



2. Fertile leaves distinct from the foliage leaves; pinnae of the foliage 

 leaf with a distinct tuft of tomentum at the base; veins in the 

 pinnules regularly once dichotomous 0. cinnamomca. 



1. Osninnda regalis L. Royal Fern. 



A large fern with stout rhizome bearing a cluster of bipin- 

 riate leaves, 2-6 feet high. Sporophylls with the upper pinnae 

 developed as a specialized sporangiophore. In s^vamps and wet 

 places. General in Ohio. 



2. Osiiiunda clayfoniana L. Clayton's Fern. 



A large fern with stout rhizome bearing a rosette of 2- 

 pinnatifid leaves 2-6 feet high. Sporophylls with specialized 

 spore-bearing pinnae in the middle. In moist places. General 

 in the state. 



3. Gsniundj cinnanidnica L. Cinnamon Fern. 



A large fern with a very large, widely creeping rhizome 

 bearing a rosette of large sterile leaves with brown colored sporo- 

 phylls within. Petioles with abundant tomentum when young. 

 Veins in the pinnules regularly once dichotomous. In swamps 

 and wet places. General. 



Folypodiaccae. Polypody Family. 



Ferns of various habits, the rhizome horizontal or erect. 

 Sporangia opening transversely and provided v/ith a vertical 

 ring. 



4. Polypodium L. Polypody. 



Ferns with creeping rhizomes articulated petioles and pin- 

 nate or simple leaves. Sori hemispherical without indusia. Veins 

 free.. 



1 . Leaves glabrous ; plant green P. vulgare. 



1. Lower surface of the leaf densely scaly; plant grayish 



P. polypodioides. 



