352 48. POLVPODIUM, §§§§§§§§ niphobolus. 



bright-coloured, spread over the whole upper part of the frond, sunk in the tomen- 

 tum. — Hk. Sp. 5. p. 45. Gynosorium, Pred. 



Hab. Kaffi-aria, Natal, Zambesi-land, Angola, Guinea Coast. — Very near the last, but 

 imalier and subsessile. 



290. P. (Niph.) albicans, Mett. ; rhizome stout, clothed with rather large pale 

 lanceolate scales ; st. 2-4 in. 1., firm, erect, naked ; fr. 1-2 ft. 1., 1-2 in. br., nar- 

 rowed gradually towards both ends, the edge entire, revolute ; texture very coria- 

 ceous ; upper surface glabrous, lower densely clothed with ferruginous tomentum ; 

 veins immersed, hidden, the main ones distinct to the edge ; sori in close rows of 

 3 to 4 each between them. — Hk. Sp. b. p. 51. 



Hab. Java. — This and the two next are the only densely-tomentose species that are 

 rigid in texture. 



291. P. (Niph.) distichocarpum, Mett. ; st. 5 in, 1., firm, erect ; barren/^. 10 

 in. 1., 1^-2 in. br., linear-oblong, narrowed to both ends ; fertile /r. 2 ft. 1., H 

 in. br,, narrowed gradually from the middle to both ends ; texture subcoriaceous ; 

 upper surface nearly naked, lower tomentose ; main veins 4 lines apart, with the 

 sori in 2 rows between them, and 5 to G areola between the midrib and edge. — 

 Mett. Fil. Ind. 2. p. 231. 



Hab. Sumatra, Korthals. — Most like the preceding, from which it may be known by 

 its biserial sori. 



292. P. (Niph.) americanum, Hk. ; rhizome very thick, clothed with large 

 spreading grey lanceolate scales ; st. strong, erect, 1-4 in. 1, ; fr. 1^-2 ft. 1., ^-| 

 in. br., narrowed very gradually downwards, the edge reflexed ; texture very 

 coriaceous ; upper surface tomentose when young, naked, bright-green and pitted 

 when mature, lower densely coated with loose dirty-white woolly tomentum ; 

 veins quite hidden ; sori large, immersed, in single oblique rows of 4 between the 

 midrib and edge. — Hk. Sp. 5. p. 54. 



Hab. Andes of Ecuador, Jameson, Spruce. — Like the last in general habit, but the 

 sori much larger and only uniserial between the main veins. The only American species 

 of Niphohulus. 



293. P. (Niph.) Gardneri, Mett. ; rhizome short-creeping, clothed with rigid 

 lanceolate black scales with a brown border ; st. 8-4 in. 1., firm, naked ; //'. 12-18 

 in. 1., 1-H in. br., narrowed very gradually towards both -ends, the edge entire ; 

 texture coriaceous ; upper surface naked, lower densely matted with grey tomen- 

 tum ; main veins straight ; the sori in close rows of about 4 each between them. — 

 Hk. Sp. 5. p. 51. Ex. F. t. 68. 



Hab. Ceylon. — Very like P. stigmosum in general habit, but the sori larger and the 

 tomentum thicker. 



294._P. (Niph.) penangianum, Hk, ; st. very short ; fr. 12-18 in, 1,, 2-3 in. br,, 

 the point acute, tlie lower part narrowed very gradually, the edge obscurely 

 undulated ; texture {)apyraceous ; upper surface naked, lower thinly clothed with 

 fine silky tomentum ; mamveins very oblique, distinct to the edge, connected by 

 nearly straight veinlets ; the areolce with 3 to 4 sori in each, the rows close toge- 

 ther, confined to the upper part of the frond, and the mass falling distinctly short 

 of the edge, — Hk. Sp. 5. p. 52 (not p. 13), Polycainpium, Presl. 



Hab. Penang, Ladi/ Dalhousie. 



295. P, (Nii)h,) Boothii, Hk, ; st. 1 ft. or more 1., firm, erect, with lanceolate 

 scales at the base ; /a H-2 ft. 1., 3-4 in. br., narrowed gradually towards both 

 ends, the edge entire ; texture coriaceous ; upper surface glabrous, lower with a 



