7. ASPLENIUM L. Spleenwort. 



-Sori oblong or linear, oblique to the midvein, distinct, and 

 parallel to the free veins ; indusium attached lengthwise to the 

 upper side of the vein, 



A, ANGUSTiFOLiUM Mx. Three — four feet high; fronds 

 narrowly lanceolate, thin, once pinnate ; pinnae opposite, Ian- 

 ceolate, short stalked, entire or minutely crenulate ; sori 25—30 

 on each side of the midvein, slightly curved ; indusia obscurely 

 convex. Rich woods, July — August. Reported from Jack- 

 son county by Mr. Shimek and from Muscatine county by Mr. 

 Witter. 



A. THELTPTEROiDES Mx. Frouds tufted, varying from 1 — 3 

 feet in height, lanceolate or slightly ovate-lanceolate ; pinnae 

 linear-lanceolate to almost linear, sub-pinnate, the segments ob- 

 tuse, minutely toothed ; fruit dots oblong, occasionally double, 

 3 or 4 pairs to each segment. Found in wooded districts in 

 Muscatine, Fayette, Johnson counties. July — September. 



A. FiLix-FOEMiNA Bernh, Fronds ovate-oblong to lanceo- 

 late, twice pinnate, 2 — 3 feet high ; pinnae lanceolate ; pinnules 

 narrowly lanceolate, doubly serrate ; secondary rhachis narrow- 

 ly winged ; indusium delicate, curved, frequently becoming re- 

 inform or horse-shoe shaped by crossing the vein and being 

 attached to both sides ; fruit dots short, mttre or less curved, at 

 length confluent, July. Common in the woody districts, gen- 

 erally distributed over the state, 



A. DEBENEUM Ait. Low, 6—10 inches high, linear — lanceo- 

 late in outline ; pinnae at right-angles to the rhachis, auricled at 

 the base above and sometimes below, alternate, oblong, finely 

 serrate or incised, one-half to an inch in length, sessile, firmly 

 membranaceous ; sori many nearer the midrib than the margin ; 

 stipe blackish - purple, shining. Woodland hillsides, rare. 

 Muscatine county. Reppert. 



8. CYSTOPTERIS BERNHARDI. 



Fruits dots small, round, bornLon the back of a straight fork 

 of free veins ; indusium in the form of a delicate hood, arched 

 over the sorus and attached to one side toward the midrib, falling 

 away. Delicate tufted ferns, 2—3 pinnate. 



