piLicES. . 265 



14. WOUUSIA, E. Brown. 



U. W. Ilven'Sis, B. Brown, stalks indistinctly jointed at 

 some distance above the base. Fronds oblong-lanceolate, 

 2-6 inches long, x-ather smooth and green above, thickly 

 clothed below with bristly rusty chaff, pinnate ; the pinnte ob- 

 Uong, blunt, sessile, pinuately-parted with the segments 

 indistinctly crenate. Fruit dots near the margin.— Exposed 

 rocks, Atl. Prov. and northward. 



2. W. hyperbo'rea, K. Brown. Stalks jointed. Fronds 

 narrowly oblong-lanceolate. Sparingly hairy beneath with 

 chaffy hairs, pinnate ; the pinnae triangular-ovate, pinnate- 

 ly lobed, the lobes few and almost entire. — Ravines, Atl. Prov. 

 and northward. 



3. W. glabel'Ia, E. Brown. Stalks jointed as in the two 

 preceding species. Frond linear, very delicate, smooth, pin- 

 nate. Pinnse roundish-ovate, the lower somewhat distant, 

 crenately-lobed. — Moist rock's, Atl. Prov. and northward. 



4. W. obtu'sa, Torr. Stalks not jointed. Frond broadly 

 "lanceolate, beset with small glandular hairs, once or nearly 



twice pinnate. Pinntepinnately parted. Segments of pinnse 

 crenately toothed. — Cliffs and rocky places ; rare. - 



15. DICKSO'NIA, L'Her. Dicksonia. 



D. punctllo'bula, Kunze. Pleasantly odorous. — Moist 

 shady places. 



16. OSMIIN'DA, L. Flowkking Fekn. 



1. 0. rega'lis, L. (Flowering Fkrn.) Fronds twice- 

 pinnate, fertile at the top, very smooth, pale green. Sterile 

 pinnules oblong-oval, finely serrate towards the apex, 1-2 

 inches long, either sessile or short-stalked, usually obliciue 

 and truncate at the base. — Swamps, along streams and lake- 

 margins. 



2. 0. Claytonia'na, L. Fronds large, once-pinnate, pale 

 green, densely white-woolly when unfolding from the bud, 

 with fertile pinnm among the sterile ones. Pinuee deeply pin- 

 natifid, the lobes entire.— Low grounds. 



