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. Hk. Sp. 4. p. 32. 



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

 Australia ; Cape Colony, Natal, Mascaren Isles. 



33. A. (Polyst.) flexum, Kunze ; rhizome stout, wide-creeping ; st. scattered, 

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

 deltoid, 6-9 in. 1., 4-6 in. hr. ; 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, Colla. Hk. Sp. 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. or. ; pinnl. distant, 

 sublanceolate, unequal-sided, 1-1 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. p. 34. t. 230. 



Hab. Panama, Seemann. 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 

 pinnce 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 ; texture 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 fill up the lobes. Hk. Sp. 4. 

 p. 32. *. 224. Dicksoniii apiifolia, Sw. teste Kuhn. 



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

 Dicksonia coniifolia, of which Dr. Grisebach supposes it to be a dimorphic form. 



36. A. (Polyst.) frondosum, 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 pinnae much the largest, 6-12 in. 1., 3-4 in. br., 

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



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

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

 veins of lobes often forked ; sori large, copious, principally in two rows near the 

 midrib. Hk.Sp..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. ]., 

 .'5-4 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 surfaces naked, rachis nearly so ; sori small, prin- 

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



