MOUNT ROEAIMA IN BEITISH 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 Boraima, *C><><> ft., McConnell 8f Quelch, 111, 118, 570. 



42. Polypodium marginblltjm, Sw. El. lnd. Occ. iii. p. 1031 ; Baker, in Trans. Linn. 

 Soc. Ser. II. Bot. ii. (1887), p. 291. Mecosorus marginellus, var. major, Klotzscb ; 

 R. Schomb. Reisen in Brit.-Guiana, iii. p. 1054. 



Roraima: upper slope. McConnell 8f Quelch, 51; summit, SOOO ft., McCounr/l 8f 

 Quelch, 117, 119, 508. 



West Indies, Venezuela, Peru, Brazil, Samoa, and St. Helena. 



Swartz (Fl. Ind. Occ. iii. p. 1031) says this species has '• venis bifidis"; subsecpient 

 authors describe the veins as simple, which is the case in all the specimens at Kevv. 



43. Polypodium leptopodox, C. H. Wright, n. sp. ; ad P. marginellwm, Sw. accedit ; 



differt fronde membranacea, marginibus ciliatis, venis unifurcatis, 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, 8000 ft., McConnell 8f Quelch, 509. 



44. Polypodium furcatum, Mett. in Abhandl. Senck. naturf. (ies. ii. (1858), p. 34; 

 Baker, in Trans. Linn. Soc. Ser. II. Bot. ii. (1887), p. 291. 



Mazaruni, 250 ft., McConnell 8f Quelch, 570; between 250 and 3000 ft., McConnell Sf 

 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. II. Bot. ii. (1N87), p. 291. Xiphoi>leris serrulata, Kaulf. ; R. Schomb. 

 Reisen in Brit.-Guiana, ii. p. 272, iii. p. 1050. 

 Mazaruni, between 250 and 3000 ft., McConnell fy Quelch, 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. strictissimum, Hook. Sp. Fil. iv. p. 175. 



Summit of Roraima, 8000 ft., McConnell 8f Quelch, 555. 

 Ecuador. 



m2 



