FILICES. 651 



5. SCHIZ^A, Sm. 



Sporangia sessile, ovate, 2-4-serial on the concave back of revolute, contracted Icafseg- 

 meuts : the latter forming terminal appendages of the nerves of the sterile leaf. — Leaf X-pal- 

 matinerved, rigid : fertile segments short, umally pilose beneath. 



13. S. elegans, Siff. Leaf\aXi^-'^&\Mie&,dichotomoualypalm.atisect: segments cuneate, 

 unequally palmatifid : lobes oblong, inciso-dentate at the summit : nerves flabeUate-dicho.- 

 tomoiis : fertile appendages pinnatipartite : segments recurved, 6-10-jngal ; sporangia 2- 



' serial. — Fahl, Sgmb. 2. t. 50. — Acrosticbum, V. — 1'-2' high; leaf-segments 3"-5" long, 

 lobes _8"'-3"' broad, fertile appendages 4"'-6"' long.— Hab. Jamaica!, Pd., very rare, in 

 dry woods, Westmoreland, Bluefield Monntains at 2000' alt. ; Trinidad I, Pd., Or. ; [Mexico 

 to Brazil]. 



14. S. pennula, 8w. Leaf simple, filiform, uuicostate-3-gonal, shortly tapering at the 

 summit : fertile appendage subpalmatisect (contracted pinnatisect) : segments 6-2-jngal, 

 incurved, pilose beneath; sporangia 4(-2)-serial. — Schk. Orypt. t. 136./. dext. Rook. 

 Gen. t. 111. A. Hook. Grev. Ic. t. 54. — S. trilateralis, Sohk. S. subtrijuga. Mart. (Kze. 

 Fani&r. t, 98. f. 1) : onr Trinidad form, not to be distinguished but by lower growth and 

 shorter ajipendages. — 14"-4" high ; appendages 8"'-12"' long. — Hab. Trinidad !, Cr. ; 

 [Guiana!, Brazil!]. 



6. LYGODIUM, Sw. 



Sporangia shortly^pedicellate at the summit (hemianatropous), oval, 2-serial on the back 

 of appendages of the leaf-margin, each supported by an epiphyUous scale. — Stem twining ; 

 leaves divided, or compound ; fertile appendages oblong -linear, blunt, crenate. 



15. Xi. volubile, Sw. Stem cylindrical; leaves pinnate: leaflets 3-5-jugal, oblong- 

 lanceolate, undivided, jointed at the base : veins forked : fertile appendages short, termina- 

 ting numerous, small serratures. — SI. t.i6.f. 1. Sohk. Crypt, t. 138. — L. scandens, Schk. 

 — Leaflets (the appendages excluded) 3"-5" long, 5"'-6"' broad, truncate or rounded at the 

 base, appendages 1" -2"° long. — Hab. Jamaica!, Wils. ; Trinidad !, iocM., P^^. ,• [Cuba!, 

 to Brazil !]. 



16. Ii. vennstum, Sw. Stem cylindrical, jointed; leaves Z-3-pinnate: leaflets 2-6- 

 jugal, hastate-Z-partite at the base, pinnatifld-serrate above it : petiole pilose : fertile appeu- ' 

 dages as long as the transverse diameter of the blade, terminating chiefly the lower lobes. — 

 Sohk. Crypt, t. \Z9.flg. sup. — L. polyraorphum, Kth. — Leaflets (the appendages excluded) 

 l"-a" long, 6"'-l"' broad at the base ; appendages 3'" long.— Hab. Trididad \,Sch. j [Mexico 1 

 to Brazil!]. 



Tribe III. GLBICHENIE^, R. Br.— Sporangia with a transverse, or oblique, complete 

 ring about the middle, longitudinally dehiscent, saperflcial or sunk into the leaf. 



7. MEKTENSIA, W. 



' Son round, naked, superficial, serial, dorsally inserted into special veinlets : sporangia sub- 

 sessile, usually few in each sorus : ring transverse (or oblique). — Leaf rigid, forked, or di- 

 chotomausly divided: segments pinnatipartite, or pinnatisect, 



* Veins bifid. 



17. Iffl. Bancroftii, Eji, Petiole simply forked : primary segments 2-pinnatisect, ' 

 tertiary ones numerous, horizontal, linear, bluntish, entire, revolute at the margin, adnate- 

 decurrent at the base, hence somewhat distant, glabrous, glaucous beneath, uppermost de- 

 crescent ; sori of 3-4 sporangia at the simple forking of the veins.— f /am. Ml. t. 25. Hook, 

 Spec. 1. t. 4. ^.— Gleichenia, Hook. M. glauca jamaioensis, Sw.—Z'-i' high; secondary 

 leaf-segments 10"-6", tertiary 9"'-6'''' long.— Hab. Jamaica!, Bancr., Pd., Al., rare, nean 

 the summit of the Blue Momitains ; [French islands I ; Mexico I to Brazil !]. 



18. la. fiircata, W. Petiole 2-3-chotomous : leafy portions repeatedly dichotomous, , 

 pinnatipartite, oblong-Hnear, shortly tapering at the summit, v,ltimate and penultimate fm-h- , 

 ings of nearly equal length : segments linear, blunt, equally dilated at the base, glabrons or 

 whitish-villous beneath ; sori of 3-S sporangia near the simple, forking of the yema.—^Flum. 



2 K 



