13b FLORA OF THE UPPER SUSQUEHANNA, 



CAMPTOSORUS Link. 



C. rhizophyllus (L.) Link. Walking Fern. Walking-Leaf. 

 Rare. Found only in a few restricted areas in our region, 

 Lockwood, N. Y. ; scarce, Barbotir. On rocks west of Barton; 

 rare, Fen^io. On sandstone rocks in various places about Sus- 

 quehanna, Gviwes. South Oxford and on sandstone rocks in 

 several places about Oxford. Coville. Fronds gradually nar- 

 rowing from a heart-shaped base, into a long, narrow tip, which 

 bends over and rooting at the apex, gives the common name to 

 the fern. Fruit dots much like Aspietiiinn. 



PHEGOPTERIS Fee. 



P. Phegopterls ( L. ) Underw. Beech Fern. Common on wet 

 rocks m sun or shade. Frond triangular in outline, longer than 

 broad, bi-pinnatifid, the lowest pair of pinnae standing forward. 

 Fruit dots small, round, without indusium. {P. polypodioides 

 Fee.) 



P. hexagonoptera (Michx.) Fee. Six-Angled Polypody. Broad 

 Beech Fern. Tolerably common in rather dry, rich woods. In 

 appearance much like the preceding, except that the fronds are 

 broader than long, the lower most pair of pinnae much larger, 

 their pinnules pinnatifid. 



P. Dryopteris (L. ) Fee. Oak Fern. Plentiful in rich, moist 

 woods, occasionally in company with P. Phcgopteris. Fronds 

 small, quite like the bracken in miniature. 



DRYOPTERIS Alans. 



D. Thelypteris (L.) A.Gray. Lady Fern. Marsh Shield Fern. 

 Abundant in swamps, wet woods and other low grounds. Fronds 

 lanceolate, nearlytwice pinnate on long stipes. Fruit on the back 

 of fronds late in the season. In shade this fern is usually com- 

 pletely sterile. {Aspidhun T/ie/ypterts ^^\) 



D. Noveboracensis (L. ) A. Gray. New York Fern. Common 

 in moist woods, especially in uplands. Stipe short; frond very 

 thin, tapering both ways from the middle. Distinguished from 

 the preceding, which it much resembles, by the thinner texture 

 of the frond and by the pinnae gradually narrowing to mere 

 ears at base. {AspidiuDi Novchoraciusis Sw. ) 



