660 FILICES. 



— Hab. Jamaica !, Pd., on trees in high mountains, S. Georges ; Trinidad ; [Cuba ! to 

 French islands ! ; Mexico ! to Peru !]. 



Teibk V. POLTPOD1EJE. — Sporangia with a vertical or oblique, usually incomplete 

 ring, transversely dehiscent. 



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

 marginal anastomosis. 



10. DICKSON I A, L'Her. 



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

 shaped or2-lipped; receptacle prominent. — Leaves usually much divided: veiulets free, 

 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, subcoriaceous, brownish. — 

 Hook. Spec, t. 24. A. — Primary segments 1J' long, 10"-12" broad, quaternary inferior 

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

 Jamaica !, A/., peak of Blue Mountains ; [Guadeloupe ! ; Venezuela ! ; New Granada !]. 



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



67- D. dissecta, Sw. (non Hook.). Leaves 2-pinnatisect, glabrous : secondary seg- 

 ments pinnatipartite, tertiary pinnatifid or loicer pinnatiparlile, their fertile lobes with a 

 single sorus near the base of the upper margin : terminal sterile lobe sublruncate-rounded, 

 crcnate ; indusium hemispherical-cup-shaped, reflexed, submembranaceous, entire "at the 

 margin. — Plum. Fil. t. 30. — D. adiantoides, W., Kze. I {non Hook.). D. eicutaria, a, 

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

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



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

 snperior lobe somewhat larger than the rest. — D. tenera, Pr. : a form with the lobes of a, 

 the crenatures of $. 



/3. 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. [j D. dissecta, Schk. t. 130. b. infra) : a form 

 with more pinnatipartite tertiary segments. 



Hab. Jamaica !, Pd., Wits., Wiles, in woods ; [Cuba ! to French islands ! ; Mexico ! to 

 Brazil !]. 



68. D. eicutaria, 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 lobe shortly obovate, dentate at the summit ; 

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

 Hook. Spec. t. 26. C— D. apiifolia, Hook, (non Sw.), Eat. PL 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. Pi-imary segments much smaller, the inferior about 1 

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

 [Venezuela ! to Peru !]. 



69. D. rubiginosa, KnvJf. Leaves 2-pinnatisect, hairy on the ribs beneath: secon- 

 dary segments 2-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 : terminal sterile lobe small, 

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

 — Hook. Spec. t. 27. A. — D. dissecta, Hook. — Primary pinnae about H' long, 5 "-8 

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

 Mexico '. to Brazil !], 



