16 ACROQENS. 



rocks. P. roiundifdlia, New Z. P. hastdta, S. Af., small ferns, In- 

 troduced. 20. Doryopteris, sori marginal. D. pedaia, frond pedate, 

 2'-6' lone, veins reticulate. W. Ind.,S. Am. 31. Pteris. Sori mar- 

 ginal. Veins free. P. aquUin«, Common Bkackbn, fronds 2-3-pin- 

 nate, triangular, l°-5° high, rough. Common. Duct, Fig. 220, C. P. 

 quadriaurita, frond pinnate, with lohed branches below ; striped. E. 

 and W. Ind. 'P.crUiea, l°-2°high, handsome; P. fow^'i/SHa, pinnate, 

 oblanceolate; both native to Florida and other tropical regions. 



23. Adiintum.— Sori marginal. A. peddtum, Biedfoot Maiden- 

 hair, frond 2-forked, pinnate, delicate; common. A. hispidulum, 

 similar, Australia. A. CapiUue- Veneris, True Maiden-hair (Vb- 

 Nus Maiden-hair). Frond 6'-18' high, ovate-lanceolate, 2-4-pin- 

 nate, pinnules exquisitely gauze-like and delicate on fine black shining 

 hiiir-like stalks ; the loveliest of the ferns ; on shaded dripping rocks, 

 and at the mouth of wells. Tropical and temperate regions of both 

 worlds ; finest specimens found at Cumberland Falls, Kentucky. Fig. 

 34. A. cethi6picu?n, similar, Af. ; A. cunedtum, larger, S. Am. A. 

 maerophpllum, frond large with few large pinnse, W. Ind. 



23. Nothochlaena nivea, ii.fldvens ; small ; and 24. Gymnogrdmma 

 ealomelauos, G. sulphurea, G. triangularis, larger ; fronds 2-3-pinnate, 

 dusted beneath with white or yellow powder, are the Gold- and 

 Silver-Fhrns of tropical Am. 



25. Phegopteris, Beech F. Sori medial, frond triangular; veins 

 free. P. Di-yopteris, frond 4'-6' wide, with 3 stalked divisions 1-2- 

 pinnate. Common N. P. Aexagondptera, larger than last, frond 

 broader than long. 2-pinnatifid. Common N. and 8. P. polypodi- 

 oMes, frond 4'-9' long, longer than broad, 2-pinnatifid. N., U. S. 



26. Phlebodium aureum, frond stalked, broad ovate, pinnately 

 parted, large, showy; veins netted; Florida, "W. Ind. 37. Nipho- 

 bolus Lingua, frond i'-%' long, lanceolate, entire, netted. Japan. 

 28. Catnpyloneurum. Veins parallel, netted, veinlets arched. C. 

 Fhyllitidis, frond simple, linear-lanceolate, l°-2° long, l'-2'' wide, 

 shining. Trop. Am. C. magnifieum, fronds large, pinnate, pinnse 

 18' long, 4' broad. Showy. Venezuela. 29. Polypidium, veins 

 free, sori globose, naked. An extensive genus, cosmopolitan. P. in- 

 cdnuin, fronds 2'-8' high, lanceolate, pinnatifid, scurfy beneath. 

 Shades, S. ; often on trees. P. vulgdre, similar, but larger, not in- 

 canous ; evergreen. Kocks. Common. 30. Platycferium, Stag- 

 horn F. Sori in amorphous patches ; fronds ribbed, netted, furcate, 

 lobed, or laciniate. Showy ; natives of Australia and tropical Asia 

 and Af. P. alcicdrne, fertile frond articulate, 1° high, 2-3-furcate; 

 whitish beneath. P. Walllchii, P. biforme, are fine species. 31. 

 Acrostichum. Sori in a dense mass ; veins netted. A. aureum (only 

 species), tall-growing, 8°-10° high, with a thick rhizome and bold 

 pinnate evergreen fronds, the upper pinnae fertile. Marshes near the 

 sea; Florida, W. Ind., S. Am., Australia, Pacific Isles, E. Ind., 

 Madagascar, S. and W. Africa. 



Tribe 9. Ophioglossicex. — Sporangia ringless, globular, opening 

 transversely by 2 valves. Fertile frond or portion of frond contracted, 

 flower-like. Sterile frond net-veined, succulent, not circinate in ver- 

 nation. Short rhizome (or crown) with fleshy roots. Spores tri- 

 angular, making this tribe the connecting link with Lycopodiacese 

 through Phyllogldssum. 3 genera : 



