MOUNT RORAIMA IN BRITISH GUIANA. 83 
membranous. Frond linear, simple, entire, 3-4 in. long, 1-1} lin. wide, rigidly 
coriaceous, glabrous, gradually contracted into a very short, but distinct, stipe; veins 
immersed, concealed. Sori oblong, superficial, parallel with the midrib, often confluent. 
Summit of Roraima, 8600 ft., McConnell & Quelch, 111, 118, 570. 
42. POLYPODIUM MARGINELLUM, Sw. Fl. Ind. Occ. iii. p. 1631; Baker, in Trans. Linn. 
Soc. Ser. II. Bot. ii. (1887), p. 291.  Mecosorus marginellus, var. major, Klotzsch ; 
R. Schomb. Reisen in Brit.-Guiana, iii. p. 1054. 
Roraima: upper slope, McConnell § Quelch, 51; summit, 8600 ft, MeConnell A: 
Quelch, 117, 119, 568. é 
West Indies, Venezuela, Peru, Brazil, Samoa, and St. Helena. 
Swartz (Fl. Ind. Occ. iii. p. 1631) says this species has * venis bifidis" ; subsequent 
authors describe the veins as simple, which is the case in all the specimens at Kew. 
43. POLYPODIUM LEPTOPODON, C. H. Wright, n. sp.; ad P. marginellum, Sw. accedit ; 
differt fronde membranacea, marginibus ciliatis, venis unifureatis, stipite elongato 
tenui piloso. 
Rhizome shortly creeping, 2 lin. in diam., with brown lanceolate scales near the apex. 
Frond oblanceolate, obtuse, up to 2 in. long by 3 lin. broad, glabrous except for a few cilia 
on the margin when young, edged with a black line; veins once forked, conspicuous ; 
sori few, near the apex of the frond, often confluent; stipe up to 2} in. long, slender, 
pilose. 
Summit of Roraima, 8600 ft., MeConnell A: Quelch, 569. 
44. PoLYPODIUM FURCATUM, Mett. in Abhandl. Senck. naturf. Ges. ii. (1858), p. 34; 
Baker, in Trans. Linn. Soc. Ser. II. Bot. ii. (1887), p. 291. 
Mazaruni, 250 ft., McConnell & Quelch, 576; between 250 and 3000 ft., McConnell & 
Quelch, 584. 
British Guiana: upper slope of Roraima; below and above the Kaieteur, Potaro 
River; also in French Guiana, North Brazil, and the Island of Grenada. 
45. POLYPODIUM SERRULATUM, Mett. Fil. Hort. Bot. Lips. p. 30; Baker, in Trans. Linn. 
Soc. Ser. Il. Bot. ii. (1887), p. 291. Xiphopteris serrulata, Kaulf.; R. Schomb. 
Reisen in Brit.-Guiana, ii. p. 272, iii. p. 1056. 
Mazaruni, between 250 and 3000 ft., MeConnell & Queleh, 592. 
British Guiana: upper slopes of Roraima; also in the West Indies, Central America, 
Venezuela, New Granada, Ecuador, Peru, Bolivia, Brazil, Sandwich Islands, Mascarene 
Islands, and West Tropical Africa. 
Var. srRICTISSIMUM, Hook. Sp. Fil. iv. p. 175. 
Summit of Roraima, 8600 ft., MeConnell & Quelch, 555. 
Ecuador. 
