/ y 



9 



A, CRiSTATUM SwARTZ. 12—20 inches high; stipes with 

 chaffy scales ; fronds oblong or lanceolate, dark green, narrow ; 

 pinnae short, oblong-lunceolate or triangular-ovate, pinnately 

 cleft and minutely toothed ; fruit-dots large, midway ; indusium 

 reniform, sinus shallow. Found in a damp ravine along Mil- 

 lar's creek and in a boggy place near Bayfield, Cedar river re- 

 gion. Muscatine .county. Scarce. Reppert. 



A- THELYPTERis SwARTZ. Fronds elongate-lanceokte, an- 

 nual, from creeping rootstocks, decaying in autumn ; pinnae hor- 

 izontal, slightly recurved, lanceolate, deeply pinoatifid, seg- 

 ments ovate-oblong, obtuse or appearing acute during fruiting 

 seasonwhen the margins are reflexi^d ; venation simple or sim- 

 ply forked ; fruit-dots about midwriy between margin and mid- 

 rib, soon confluent Delaware, Johnson, Fayette counties. 



A. SPINULOSUM SwARTZ. Stipes with a few pale-brown d*^- 

 ciduous scriles ; fronds ovate-lanceo'ate, pinnae oblique to the 

 rhachis, elongate triangular, the lower .pairs broadly triangular; 

 pinnules oblique to the midrib, connected by a very narrow 

 wing, oblong, incised or pinnatifid with lobes spinulose toothed, 

 indusia smooth without m^n-ginal glands — Underwood. Lee 

 county — Arthur ; Muscatine county — Arthur and Witter. 



10. PHEGOPTERIS FEE. Beech-Fern 



Fruit dots small, round ; indusium wanting, bornton the back 

 of free veins below the apex. Fronds membranaceous, green. 

 Stipe continuous with the rootstock. 



* Rhachis winged^ fronds two pinnate. 



P. hexagonoptera Fee. 1—2 feet high; stipe long, 

 smooth, frond triangular-ovate, pinnae lanceolate, acuminate, 

 opposite, deeply pinnatifid, sessile; segments on upper pinnae 

 oblong, obtuse, entire or toothed ; lower segments alternate, 

 toothed or pinnatifid, basal lobes united to form a many angled 

 winged rhachis ; fruit dots near the margin of the segments or 

 between the sinus and the secondary rhachis Common in rich 

 shady hillsides in the eastern counties. July — September. 



P. POLTPODioiDES Fee. Low 5 — 9 inches high ; fronds tri- 

 angular, longer than broad, twice pinnate ; pinnae elongate 

 lanceolate, bases decurrent on the primary rhachis, lower pair 



