riLICES. 661 



S. apiifolia, Sw. (Jamaica), is still doubtful. Swarfz says -it resembles very much B. 

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

 specimen ; but this would answer to D. Selloioiana', Hoot. (Ecuador, Spruce), and what 

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

 species (" leaves rigid, pale beneath, ultimate''segment3 sharply serrate "). 



11. DAVALIIA, Sm. 



Son roundish or cup-shaped, inserted into the summit of a veinlet or between its forldng, 

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

 summit. — Veiolets/ree, rareli/ anastomosing at the indmiiem. 



Sect. 1. MiCROLEPiA, Pr. — Son at the summit of a simple veinlet, dorsally covered hy 

 a membranaceous, rarely herbaceous indusium. — ^Veinlets pinnate. 



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

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

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

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

 more produced subdenticulate leaf-serrature.— P&jm. Fil. t. 7.— Dicksonia Plnmieri, Hook. 

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

 about 1" long, 4"'-3"' broad. — Hab. Jamaica!, Wiles, ih-ight j Domimcal, Imr. ; [Cuba I 

 to French islands!]. 



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

 with a narrowly margined rhachis, serrate at the acuminate snramit, 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. — Hooi. Spec. t. 57. B, — Primary seg- 

 ments about 14' 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. 1 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. PI. Wr.! (non Sw.). Microlepia Antillarum, Mett. ap. Sat. — Primary seg- 

 ments 14'-6" long, 3"-2" broad, ultimate inferior usually .6"'-4"' long, 3"'-2"' broad.— 

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

 Brazil !]. 



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

 mosing veinleis, sunk into the apex of narrow or cuneate leafrsegments, the firm indu- 

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

 or simjilc in the ultimate segments. o 



73. D. clavata, Sw. Slender, erect, unarmed; leaf 8-piunatisect: segments narrowly 

 linear-cuneate, eidive, ientictiate at the subtruncate or rounded summit, glabrous: their 

 single rib once- or twice-forked, rarely simple ; indusium halt-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. Sohk. Crypt, t. 128. — Adiantum, 

 L. Lindsaya, Bemh. D. veunsta, Schk. D. tennifolia, Sieb. Mart. : 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 B. tenuifolia. Hook. ! is D. cuneiformis, Sw. ! (in Fors- 

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

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

 would be a true Bavallia : 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 L). cunei- 

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



Lindsayee {e.g. L. microphylla, Sw.), I regard the latter (i. § 2, Mett.) as congeners of 

 Davallia,—V{-%')\a^, divided from about the middle; segments 4"'-2"' long, 1'"-^'" 



