420 ORDER 159. F1L1CES. 



P, Ai.cic6RNE. Sterile fronds roundish, lobed, spreading ; fertile erect, 1016', dark- 

 green above, pale beneath, fruiting on its 24 lanceolate segments. Curious. 



12. POLYPODIUM, L. POLYPODY. Sori roundish, scattered on vari- 

 ous parts of the under surface of the frond, with no indusium (cover or in- 

 volucre). Ferns of various habit. 



* Fronds pimple and entire, pinni-veined, with cross veinulets Nos. 1, 2 



* Fronds pinnatifid or pinnate, with forking veinlets Nos. 36 



* Fronds bipinnatifid, the veinlets forked (PHLEGOPTERIS) Nos. 79 



1 P. Phyllitidis L. Fronds lance-linear, 1 2f, pointed, thin and papery, with the 



frnit-dots arranged in a double row between the veinlets. Fla., and W. Indies, t 



2 P. LiNGUA. Fronds lance-ovate, 612', obtuse, smooth above, rusty-downy beneath, 



and there covered with the innumerable sori, in rows. China. 



3 P. iiicaniim Ph. Fronds deeply pinnatifid, 36', thick, clothed with whitish 



scales beneath ; pinnae oblong-linear, the upper fruitful ; sori distinct and separate ; 

 veins invisible. Grows on the mossy bark of trees, W. and S. 



4 P. vulgare L. Fronds deeply pinnatifld, smooth, 6 12', pinnae linear-oblong, alter- 



nate, sori large, in 2 rows, distinct, yellow-brown. On shady rocks. 



5 P. PLUMULAWilld. Fronds lance-linear, If x If; pinnae linear-oblong, very numerous, 



attached to the hairy rachin by a broad base. Fla., and cultivated. 



6 P. ANGUSTIFOLIA. Fronds lin. -lanceolate, !S'x2', bright green ; pn. oblong, attached 



to the chaffy rachis by the mid-vein only, the base auriculed on the upper side. 



7 P. Plileg6pteris L. Beech P. Frond bipinnatifid, longer than wide (3 C'), the 



lower pinnae curved, but scarcely larger than the middle ones ; sori all marginal, 

 about four on each segment ; stipe hairy. Woods, Can. to Penn., and W. 



8 P. hexagonopterum MX. Frond bipinnatifid, broader than long, rachis pecu- 



liarly winged ; lower panicle much enlarged, deflexed ; sori partly marginal, many on 

 each segment ; stipe smooth. Woods. Rather common. 



9 P. Dryopteris L. Ternate P. Frond ternate, the divisions stalked and bipinnato, 



light green, thin and delicate; sori marginal. Woods, Penn., and N. 

 /3. calcareum. Divisions of the frond more rigid, erect. Northward. 



13. GYMNOGRAMMA, Desv. Fronds 2-8-pinnate, covered beneath 

 with a white or yellow farinaceous powder. Sori arranged in rows along 

 the veins. A beautiful genus, much cultivated. Tropical America. 



* Golden Ferns, the fronds yellow-powdery beneath Nos. 13 



* Silver Ferns, the fronds white-powdery beneath, 2-pinnatc No. 4 



1 G. TRIANGULARIS. Stipes clustered, slender, 3 12', polished, ebony-brown ; frond 5- 



angled, 18', pedately pinnate ; pinnae triangular-oblong, finally the fertile covered 

 with the russet sori beneath. Common in California. Very fine. 



2 G. stixPHUREA. Stipe and rachis brown, at first powdery ; frond 6 10', lanceolate, 



bipinnate ; pinnae lanceolate ; segments cuneate, cut-lobed, crenate at the obtuse 

 apex. From Jamaica (Rev. E. Wilson), and cultivated. Very delicate. 

 I G. CHRYSOPHYLLA. Frond triangular-lanceolate, bipinnate ; pinnae lanceolate, nearly 

 contiguous ; pinnae cut-crenate-lobed. Golden yellow beneath. 



0. MERTENSII. Pinnae rather remote, narrow lanceolate, long-pointed. 

 \ G. CALOMELAKOS. Frond 2 3f, lance-ovate, stipe and rachis brown, polished ; seg 

 meuts entire or with a single tooth, cream-white beneath. 

 /3. PERUVIANA has the lower segment hastate-lobed and very rich green. 



14. NOTHOL2ENA, Br. Frond 1-2-pinnate, scattered, coriaceous, 

 chaffy, or powdery beneath. Sori marginal, linear, continuous, naked. 

 Sporangia short-stalked. 



