31. PTERIS, LITOBKOCHIA. 169 



Hab. Discovered at or near Elephants' Bay, West Tropical Africa, by the late Dr. 

 Curror, and fine specimens were procured on the mountains of Fernando Po at 3-500 ft., 

 by Gustave Mann. /3, which is not unlikely a distinct species, was gathered on the 

 Niger expedition by Barter, who describes the rhizome as creeping. This comes very- 

 near Lonchitis in texture, and the sori are often only reniform, and show a decided 

 preference for the sinuses. 



66. P. (Lito.) denticulata, Swartz ; st. about 1 ft. 1., slender, wiry, naked ; 

 fr. 12-24 in. 1., 8-12 in. br. ; upper pinna simple, linear, 4-6 in. 1., ^-f in. br., 

 united at the base, finely spinuloso-serrated when barren, those next in order 

 quite cut down to the rachis and forked, the lower ones often pinnatifid with 

 several linear pinnnl. 9 especially on the lower side ; texture subcoriaceous ; veins 

 fine, anastomosing copiously ; rachis and both surfaces naked ; sori not quite 

 reaching the point of the pinnules. Hk. Sp. 2. p. 215. Hie. & Gr. t. 28. 

 /8, P. Brasiliensis, Raddi ; pinncs broader, 6-9 in. 1., 1 in. br., more compound. 

 .#/>. 2. j>. 214. 



Hab. Tropical America, from the West Indies southward to Brazil. The typical form 

 much resembles cretica in general aspect. 



67. P. (Lito.) Hcenkeana, Presl ; st. 1-3 ft. 1., pale, firm, naked ; fr. several 

 ft. ]., the upper part with numerous, simple, linear pinnae on both sides, which 

 are 6-9 in. 1., 1-1^ in. br., acuminate at the point, narrowed gradually towards the 

 base, the lower ones slightly stalked and about 2 in. apart, the barren ones 

 finely spinuloso-serrated, the lower pinnae often 1 ft. or more 1., spreading with 

 numerous similar pinnl.; texture coriaceous ; rachis and both surfaces naked ; 

 veins fine, clearly visible, anastomosing copiously ; sori not quite reaching the 

 point of the pinnules. Hk. Sp. 2. p. 213. 



Hab. Tropical America, from Guatemala and New Granada southward to Peru. 



68. P. (Lito.) pulchra, Schlecht. ; st. strong, erect, naked, polished, straw- 

 coloured ; fr. ample, simply pinnate above, with numerous sessile linear, 

 acuminate pinnce on each side, which are 4-6 in. 1., ^-f in. br., slightly serrated 

 towards the point, lower pinnae simply pinnate, 1 ft. or more 1., 6-9 in. br., 

 nearly opposite, 1 in. or more apart ; texture coriaceous ; rachis and both 

 surfaces naked ; veins fine and numerous ; sori not extending to the apex of the 

 pinnules, ultimately concealing the invol. Hk. Sp. 2. p. 213. 



Hab. Mexico, ascending to 5,000 feet. 



69. P. (Lito.) macroptera, Link ; st. 1 ft. or more ]., erect, naked, polished, 

 straw-coloured or brownish ; fr. 2 ft. or more 1., 12-18 in. br., cut down very 

 nearly to the rachis in the upper part into numerous linear lobes, the lowest 

 of which are 6-9 in. 1., ^ in. br., with about 1 in. between them at the base, the 

 point narrowed very gradually and very faintly toothed when barren ; lat. 

 pinnce few, often a single pair only, like the terminal one, but smaller ; texture 

 papyraceo-herbaceous ; rachis and both surfaces naked ; veins fine but con- 

 spicuous ; sori not reaching the apex of the segments. 



Hab. Brazil, Burchell, &c. 



70. P. (Lito.) vestita, Baker ; st. slender, erect, 1 ft. or more 1., villose when 

 young, straw-coloured or brownish ; fr. 18-24 in. 1. ; terminal pinna 12-15 in. L, 

 2\ in. br., cut down to a broadly-winged rachis into numerous lobes on both 

 sides, the upper ones close, the lower ones 1 in. 1., f in. br., falcate with a space 

 between them ; lateral pinnce two on each side (in our specimens), spreading, 

 like the terminal one but smaller, caudate at the point ; main rachis and those 

 of the pinnae densely villose ; both surfaces hairy ; veins fine, anastomosing 

 copiously ; sori confined to the inner two-thirds of the segments ; invol. con- 

 sisting principally of a dense fringe of strong hairs. 



Hab. Peru, Spruce, 4063. Habit most like the next, but the pinnae much larger and. 

 fewer. 



