660 riLICES. 



-^Hab. Jamaica !, Vd., ou trees in high mountains, S. Georges ; Trinidad ; [Cuba 1 to 

 Trench islands ! ; Mexico 1 to Peru !]. 



Teibe V. POLYPODIES. — Sporangia with a vertical or oiliqae, ■umally incomplete 

 ring, transversely dehiscent. 



Series 1. Pteridess. — Sori confined to the marginal extremity of veins or their 

 marginal anastomosis. 



10. DICKSONIA, L'Her. 



Sori inserted into the summit of a veinlet ; indusium free upon the leaf-margin, cup- 

 shaped or2-lipped: receptacle prominent. — Leayes usually much divided: veinlets _/)•«?, 

 pinnate. 



* Most veinlets fertile. 



66. D. coniifolia. Hook. Leaves 3-pinnatisect, glabrous : tertiary segments pinnati- 

 partite, shortly petiolulate, distant, narrowly acuminate, quaternary inferior ones pinnatifid, 

 uppermost and lobes of the inferior dentiform, the latter dilated into the terminal sorus ; 

 indusium large, dorsally 2-lipped, at length repand, shallow, suhcoriaceous, brownish. — 

 Hook. Spec, t. %i. A. — Primary segments li' long, 10"-12" broad, quaternary inferior 

 6"-8" long, connected by the narrow wing of the rhachis ; indusium 1'" broad. — Hab, 

 Jamaica !, Al., peak of Blue Mountains ; [GuadelouJ)e ! ; Venezuela ! ; New Granada 1]. 



** Lowest anterior veinlet fertile : all sori approximate to the sinus. 



67. D- dissecta, Su>. [non Hook). Leaves 2-pinnatisect, glabrous : secondary seg- 

 ments pinnatipartite, tertiary jnnnatifid or lower pinnatipartite, their fertile lobes with a 



', single sorus near the base of the upper margin : terminal sterile loie suhtruneate-rounded, 

 crenate ; indusium hemispherical-cup-shaped, refiexed, submembranaceous, entire at the 

 margin. — Plum. Fil. t. 30. — D. adiantoides, W., Kze. ! (non Hook.). D. cicutaria, a. 

 Hook. I (non Sw). — Stout, herbaceous; primajy leaf-segments often 2' long, 6"-8" broad, 

 ultimate lobe of the tertiary segments about 3'" diam. ; indusium J'" diara. 



a. Terminal lobe of the tertiary leaf-segments rounded, its crenatures pointed : lowest 

 superior lobe somewhat larger than the rest. — D. tenera, Fr. .- a form with the lobes of a, 

 the crenatures of ;8. 



p. Ordinata, Kaulf. Terminal lobe of the tertiary leaf-segments truncate, its crenatures 

 unequal, blunt : lateral lobes subequal : rhachis puberulous beneath. — Kze. Farnkr. t. 106. 

 — D. cornuta, Kaulf. (D. Hookeriana, Kl. I; D. dissecta, Schk. t. 130. b. infra) : a form 

 with more pinnatipartite tertiary segments. 



Hab. Jamaica!, Prf., FjV,?., PTito, in woods ; [Cuba! to French islands ! ; Mexico I to 

 Brazil I]. • 



68. D. cicutaria, Sw. Leaves 2-pinnatisect, glabrous : secondary segments pinnati- 

 partite, tapering above, tertiary lower pinnatipartite, upper ones pinnatifid, their fertile 

 lobes with a single sorus on the upper margin, the lowest superior larger and usually with 

 2-3 sori on both margins : terminal sterile loie shortly obovate, dentate at the summit; 

 indusium campanulate-cup-shaped, refiexed, submembranaceous, entire at the margin. — 

 Hook. Spec. t. 26. C. — D. apiifolia. Hook, {non Sw.), Eat. PI. Fendl. ! — Distinguished from 

 the preceding by the sharply pointed teeth at the summit of the leaf-segments, and the in- 

 dusium a little longer than broad. Primary segments much smaller, the inferior about 1' 

 long, 3"-4" broad; indusium J'" long. — Hab. Jamaica (Sw., Rook), in the mountains ; 

 [Venezuela ! to Pern !]. 



' 69. D. rubiginosa, Kaulf. Leaves 2-pinuatisect, hairy on the ribs beneath : secon- 

 dary segments ^-pinnatipartite, acuminate, tertiary bluntish, quaternary dentate, or lower 



' dentate-pinnatifid, fertile near the base of the upper margin of their teeth, the lower 

 superior lobe larger, with 5-3 sori, the following with 3-1 : ieTmiaei sterile lobe smail, 

 few-dentate ; indusium minute, hemispherical-cup-shaped, refiexed, entire at the margin. — 

 — Hook. Spec. t. 27. A. — D. dissecta, Sook. — Primai-y pinnas about li' long, 5"-8" 

 broad; indusium i'" diam. — Hab. Jamaica!, Pd., Wiles, Wright, Al.: [Portorico ! ; 

 Mexico ! to Brazil !]. 



