43. ASPIDIUM, § POLYSTICHUM. 255 



densely scaly below ; fr. 1-3 ft. 1., 12-18 in. br., subdeltoid ; lowest pinnce the 

 largest, 6-12 in. 1., 3-4 in. br. ; pinnl. and segm, lanceolate, the latter bluntly 

 lobed, the teeth not mucronate ; texture very coriaceous ; rachis strong, polished ; 

 both surfaces naked ; veins immersed, pinnate ; sori 1 lin. br., in two rows 

 filling nearly the space between midrib and edge. — Polyp. L. A. coriaceum, 

 Sw. Hh. Sp. 4. p. 32. - -■ ■ ' 



Hab. America, from Cuba to Patagonia ; Polynesian Islands, New Zealand, and 

 Australia ; Cape Colony, Natal, Mascaren Isles. 



33. A. ( Polyst.) _/?«s«»i, Kunze ; rhizome ^io\A, wide-creeping; sJ. scattered, 

 1 ft. 1., deciduously scaly ; fr. 2-3 ft. 1., 9-12 in. br. ; lower pinruB lanceolate- 

 deltoid, 6-9 in. 1., 4-6 in. br. ; pinnl. lanceolate»deltoid, cut down to the rachis 

 below into oblong bluntly-lobed segm. \ in. 1., \-\ in. br. ; texture coriaceous ; 

 teeth not awned ; veins beneath prominent ; under surface and rachises scaly ; 

 sori large, in two rows, occupying nearly the space between edge and midrib. — 

 A. Berteroanum, Uolla. Hlc. 8p. 4. p. 33. t. 229. 



Hab. Juan Fernandez. — Closely allied to the preceding, from which it is distinguished 

 by its furfuraceous rachis and under surface. 



34. A. (Polyst.) Seemanni, Hk., ; st. stout, erect, the upper part naked ; fr. 

 18-24 in. 1., 1 ft. br. ; pinnce lanceolate, 6-8 in. 1., 2-2^ in. br. ; pinnl. distant, 

 suhlanceolate, unequal-sided, 1-lJ in. 1., ^-§ in. br., bluntly lobed, the lower 

 lobes reaching down nearly to the rachis ; texture coriaceous ; rachises and both 

 surfaces^ nearly naked ; midrib of the lobes prominent ; sori 4-6 in each. — Hk. 

 Sp. 4. ;;. 34. *, 230. 



Hab. Panama, Seemwrm. — ^Very near the two preceding. 



35. A. (Polyst.) ascendens. Hew. ; rhizome wide-climbing ; st. 1 ft. 1., straw- 

 coloured, polished, nearly naked ; fr. 2-3 ft. 1., 1 ft. br., dimorphous ; lower 

 pinnos of barren fr. subdeltoid, 6-9 in. 1., 3-4 in. br. ; pinnl. lanceolate-deltoid ; 

 segm. stalked, ovate-rhomboidal, cut down to the rachis in the lower part and 

 lobes acutely, not deeply toothed ; textm-e coriaceous ; rachis and both surfaces 

 glossy, naked ; fertile segm. distant, \ in. 1., ^ in. br., the edge undulated ; sori 

 in two rows, which are close to the midrib and fiU up the lobes. — Hh, Sp. 4. 

 p. 32. t, 224. Dicksonia apiifolia, Sw. teste Kuhn, 



Hab. Jamaica. — In habit this differs entirely from the other species, and coincides with 

 Didcsonia comifolia, of which Dr. Grisebach supposes it to be a dimorphic form. 



36. A. (Polyst.) frohdosum, Lowe ; st. scattered, 1-2 ft. 1., strong, straw- 

 coloured or pale-brown, polished, densely scaly below ; fr: 18-24 in. 1., 1 ft. or 

 more br., subdeltoid, the lower pinnce much the largest, 6-12 in. 1., 3-4 in. br., 

 long-stalked ; pinnl. lanceolate, erecto-patent ; segm, very unequal-sided, pin- 

 natifid, with rounded mucronate lobes, obliquely truncate at the base below ; 

 texture subcoriaceous ; raehis glossy, stramineous ; both surfaces naked ; lateral 

 veins of lobes often foi-ked ; sori large, copious, principally in two rows near the 

 xaiAxih.—Hk. Sp. i. p. 31. 



Hab. Madeira, 



37. A. (Polyst.) aristatum, Sw. ; rhizome creeping ; St. scattered, 12-18 in. 1., 

 clothed, especially below, with linear or fibrillose scales ; fr. 1-2 ft. 1., 9-12 in. 

 br., ovate-deltoid, tri- or quadripinnatifid ; lower pinnce largest, 6-9 in. 1., 

 8-4 in. br., subdeltoid ; lowest pinnl. much the largest, lanceolate-deltoid, 

 2-4 in. 1., with subdeltoid lower segm. ; teeth copious, aristate ; texture sub- 

 coriaceous, glossy ; both siafaces naked, rachis nearly so ; sori small, prin- 

 cipally in two rows near the midrib ; invol. sometimes reniform. — /3, A, conii- 



