FIL1CES. 661 



D. apiifolia, Sw. (Jamaica), is still doubtful. Swartz says it resembles very much D. 

 squarrosa, Sw., and none of our West Indian LHcksonice has any resemblance with Forster's 

 specimen ; but this would answer to D. Sellowiana, Hook. (Ecuador, Spruce), and what 

 Kunze (Bot. Zeit. 3. p. 817) says of an original specimen of D. apiifolia, agrees with this 

 species ("leaves rigid, pale beneath, ultimate segments sharply serrate "). 



11. DAVALLIA, Sm. 



Sori roundish or cup-shaped, inserted into the summit of a veinlet or between its forking, 

 at or near the flat leaf-margin : indusium dimidiate-inferior and laterally adnate, open at the 

 summit. — Veinlets yre^, rarely anastomosing at the indusium. 



Sect. 1. Microt.epia, Pr. — Sori at the summit of a simple veinlet, dorsally covered by 

 a membranaceous, rarely herbaceous indusium. — Veinlets pinnate. 



70. D. adiantoides, Sw. Leaves 2-pinnatisect, glabrous: secondary segments in- 

 ferior piimatipartite, their divisions falcate-lanceolate, serrate, broadly decurrent to the 

 next, approximate, superior pinnatifid with the lobes mo3t subtruucate : most serratures 

 fertile; indusium sunk into the margin, cup-shaped, herbaceous: aperture oblique by the 

 more produced subdenticulate leaf-serrature. — Plum. Fil. t.7. — Dicksonia Plumieri, Hook. 

 — Arborescent (Plum.) : primary segments 1'— 1-J' long, 8"-10-' broad, tertiary inferior 

 about 1" long, 4"'-3'" broad. — Hab. Jamaica!, Wiles, Wright; Dominica!, Imr. ; [Cuba! 

 to French islands!]. 



71. D. insequalis, Kze. ! Leaves 3 -2-pinnatisect, glabrous : segments pinnatipartite, 

 with a narrowly margined rhachis, sen-ate at the acuminate summit, their divisions and the 

 superior segments ovate-lanceolate, blunt, pinnatifid-serrate with the lowest superior lobe 

 more produced, fertile below most sinus ; indusium cup-shaped, membranaceous, little ex- 

 ceeded by the truncate sinus of the leaf-margin. — Hook. Spec. t. 57. B. — Primary seg- 

 ments about H' long, 8"-12" broad, ultimate 8"'-10'" long, 3"'-4'" broad.— Hab. Jamaica !, 

 Wiles, Wils., in woods ; [Venezuela ! to Brazil ! and Peru !]. 



72. D. jamaicensis, Hook. ! Leaves 2-pinnatisect, pubescent beneath : secondary 

 segments pinnatipartite, shortly acuminate, tertiary ovate-oblong, pinnatifid-few-serrate with 

 broad, bluutish lobes, narrowly decurrent to the next, fertile below most sinus ; indusium 

 half-round, membranaceous, distant from the acute sinus of the leaf-segment. — D. polypo- 

 dioides, Eat. PL Wr.f (non Sw.). Microlepia Antillarum, Melt. ap. Eat.— Primary seg- 

 ments li'-6" long. 3"- 2" broad, ultimate inferior usually 6"'-4'" long, 3"'-2'" broad.— 

 Hab. Jamaica!, Macf., Bancr., Wiles, Pd., iu moist woods; [Cuba!; New Granada!; 

 Brazil !]. 



Sect. 2. Stbnoloma, Fee. — Sori at the summit of an expanded, rarely several anasto- 

 mosing veinlets, sunk into the apex of narrow or cuneate leaf-segments, the firm indu- 

 sium forming their dorsal covering. — Habit of Lindsaya : leaf-ribs forked-dichotomous 

 or simple in the ultimate segments. 



73. D. clavata, Sw. Slender, erect, unarmed ; leaf 3-pinnatisect : segments narrowly 

 linear-cuneate, entire, denticulate at the subtruncate or rounded summit, glabrous : their 

 single rib once- or twice -forked, rarely simple ; indusium half-round or transversely oblong, 

 as broad as or little broader than the leaf-segment, equalling its summit, supported by ana- 

 stomosing or shortly-forked veins.— Plum. Fil. t. 101. b. Schk. Crypt, t. 128.— Adiantum, 

 L. Lindsaya, Bernh. D. vennsta, Schk. D. tennifolia, Sieb. Hart. : D. tenuifolia, Sw., 

 Kaulf. (non Hook.), from Forster's specimen of his Ad. clavatum, is a form of it with all 

 segments narrow, 2-ribbed, while D. tenuifolia, Hook. ! is D. cuneiformis, Sw. ! (in Fors- 

 ter's collection).— This singular species approaches Lindsaya by the auastomosis of veinlets 

 along the bases of the indusium, while from the single ribs of narrower leaf-segments it 

 would be a true Davallia : this anomaly might be interpreted as a cohesion of 2 or 4 sori 

 in the former instance, as has been done by Mettenius with respect to the allied D. cunei- 

 formis; but as there is no structural difference between D. clavata and the cuneate-leaved 



Lindsaya {e. q. L. microphylla, Sw.), I regard the latter {L. § 2, Mett.) ns congeners of 

 Davallia.— 1'(-2') high, divided from about the middle; segments 4"'-2'" long, V"-\'» 



