6 



P. GKACILI8 Hook. Rootstock long and slender ; stipe 

 short, brownish, hairy, chaffy sparing:ly at the base; fronds 

 3—6 inches high, membranaceous, delicate ; pinnae few, 3 — 5 

 pinnately incised decurrent divisions, sterile pinnae linear — 

 oblong to oblong, entire or incised, fertile obovate, crenate or 

 incised ; veins once forked. Rare, on calcarious rocks. July. 

 Has been found in Fayette, Winnisheik, Delaware, Dubuque, 

 and Johnson counties. 



5. cheilAhes SWARTZ. .... 



Fruit dots small, roundish, distinct or contiguous, , on the ends 

 of free veinlets; indusium continuous, usually membranaceous, 

 whitish, formed from the reflexed margin of the lobes or of the 

 pinnule. Low ferns 2-3 pinnate, divisions with principal vein 

 central. 



C. LANUGINOSA NuTT. Low ; from 2—5 inches, ovate, lan- 

 ceolate, woolly with soft whitish hair; pinnules one-half inch 

 long or less, lower distinct, upper crowded ; pinnules made up 

 of small densely crowded segments or else crenately pinnatifid; 

 stipe slender, inch or so in length, hairy when^o^g, becoming 

 smooth, shining, black or brown. Growing on the face of dry 

 rocky cliffs. July — August. Local. Allamakee. Winnisheik, 

 Dubuque, and Jones counties. 



6. CAMPTOSORUS LINK. Walking-leaf. 



Fruit dots ar'ranged irregularly on the back of the frond at 

 various angles to the midvein, oblong to linear, on either side 

 of the netted veins, near the midrib, single, but more or less in 

 pairs toward the margin in which case the indusia are open face 

 to face, sometimes confluent at the ends. 



C. RHizoPHTLLUS LiNK. Frond 6—12 inches long, ever- 

 green, sub-coriaceous, stalked, entire or slightly lobed below, 

 long acuminate or produced into a long recurved thread like ex- 

 tension which takes root and produces a new plant, whence the 

 name; base of the frond auiicuiate or cordate. Grows near 

 shaded calcarious cliffs. On account ol its coriacious character 



« 



this fern may be found from early spring to October. Fruiting 

 in July. Frequent in the eastern counties. 



