Proceedings of the Ohio State Academy of Science. 281 



7. Pellaea Link. Cliff-brake. 



Rather small ferns growing on rocks, with marginal sori 

 and indusia. Leaves pinnate or pinnatifid with dark-colored 

 petioles. Veins free. 



I. Pellaea atropurpurea (L.) Link. Purple Cliff-brake. 



Rhizome short and densely covered with hair-like scales. 

 Leaves coriaceous, evergreen, simply pinnate or 2-pinnate below. 

 Usually on limestone rocks. Ottawa, Stark, Franklin, Clark, 

 Greene, Highland, and Adams counties. 



8. Woodwardia Sw. Chain-fern. 



Large ferns with pinnate or nearly 2-pinnate leaves and 

 oblong linear sori arranged in chain-like rows parallel to the 

 margins of the pinnae. Venation, partly areolate. 



I. Woodzvardia virginica (L.) Sw. Virginia Chain-fern. 



Rhizome long, stout and chaffy. Sterile and fertile leaves 

 similar in outline, pinnate, the pinnae linear-lanceolate. In 

 swamps and wet ground. Ashtabula, Defiance, Geauga, Sum- 

 mit, Wayne, and Williams counties. 



9. Asplenium L. Spleenwort. 



Large or small ferns with leaves of various types, the sori 

 linear or oblong oblique to the midribs or rachises. Veins free. 



1. Leaves pinnatifid, or pinnate only near the base, tapering to a 



long point. 2. 

 1 . Leaves once pinnate, with numerous pinnae. 3. 



1 . Leaves 2-3-pinnate or pinnatifid. 6. 



2. Lobes of the leaf rounded or the lowest acuminate. . .A. pinnatHidum. 



2. Lobes acute or acuminate, the tip of the leaf frequently root- 



ing . . . .A. platyneuron X Camptosorus rhisophyllus. (A. ebenoides.') 



3. Petioles pale, green or straw-colored; pinnae linear-lanceolate with 



a long point; leaves usually 2-3 feet long A. angustifolium. 



