Procccdiiii^s of the Ohio State Acadcmx of Science. 279 



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

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

 pinnules regularly once dichotomous Q. cinnamoinca. 



1. Osinumia re<^alis L. Royal ¥tvn. 



A lar,q-c fern with stout rhizome bjariiii^' a cluster of bipin- 

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

 developed as a specialized sporangiophore. In swamps and wet 

 places, (ieneral in ( )hio. 



2. Osiiiinida claytoiiiaiia L. Clayton's I-Ymmi. 



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. Genera! 

 in the state. 



3. Osmiindj ciniiaiiidiiiea 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. 

 X'eins in the pinnules regularly once dichotomous. In swamps 

 and wet ])laces. General. 



Polyf'odiaceae. Polypody h^amilv. 



i'^M'ns of various habits, the rhizome horizontal or erect. 

 Sporangia o])ening transversely and ])r()v!ded willi a vertical 

 ring. 



4. Polypodium L. l'ol}])ody. 



I'\M-ns with cree])ing rhizomes articulated ])etioles and pin- 

 nate or sim])le leaves. Sori ]iemis])her:cal without indusia. \'eins 

 free. 



1 . Leaves glabrous : plant green /'. ^i'ldgarc. 



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



P. polypodioides. 



