

10 



deflexed and standing forward ; fruit dots orbicular, near the 

 margin of the pinnules. Woods.^ July. Found in Delaware 

 county. Macbride. 

 ** Fronds 3 divided^ divisions petioled^ rhachis wingless^, 



P. CALCARAE Fee. Frond ternate, rigid, minutely gland- 

 ular, lateral divi^^ions ascending, bi-pinnate.; sori marginal- 

 Not common. July. Has been found in Johnaon, Jackson, 

 Cedar, Allamakee, and Jones counties. This fern very much 

 resembles the early stages of Pteris aquiLina and may be mis- 

 taken for it. 



11. ONOCLEA L. 



Fronds of two kinds, fertile and sterile. Fertile fronds rigid, 

 p')d or berry like in appearance, concealing the sporangia ; ster- 

 ile fronds foliaceous. Rootstocks running, constantly project- 

 ing new fronds. /^^ 



m 



O. SENSiBiLis L. (Sensitive-Fern). Sterile frond 9—16 

 inches high, broadly or triangular- ovate ; pinnae lanceolate- 

 ovate, reticulate veined, deeply pinnatifid into obloog segments 

 or else sinuately lobed. Moist thickets. July. Frequent. 

 Widely distributed over the state. 



O. STRUTHioPTERis HoFFMAN. Sterile fronds in a cluster or 

 corm of decaying stalks, short stalked, 2—5 feet high, broadly 

 lanceolate ; pinnae lanccDlate, linear, tapering gradually, free 

 veined, sessile, pinnatifid into long lobes, projecting forward ; 

 fertile frond shorter, pinnate into globular pinnae. Stolonifer- 

 ous. Frequent in moist wooded places near streams in the 

 eastern and western portions of the state. July. 



12. WOODSIA R. BROWN Rock Polypod. 



Fruit dots round, borne, on the back of forked free veins ; in- 

 dusium delicate, attached by the base beneath the sorus, bursting 

 above into several segments 



W. OBTUSA ToRR. Fronds 5 — 12 inches, lanceolate, minute- 

 ly hairy ; pinnae few, broadly ovate or oblong, bluntish, pin- 

 nately parted or pinnatifid, segments oblong, obtuse, crennately 

 toothed or toothed lobed ; veins free, forked, bearing fruit dots 



