100 THE VOYAGE OF H.M.S. CHALLENGER. 



"On both sides of the Central Kidge, at 2000 to 2700 feet, above Swampy Gut, &c. ; 

 somewhat rare." — Melliss. 



A distinct species, being the only one of the Elaphoglossum section that has the fronds 

 distinctly incised or crenated. 



Acrostichum (Elaphoglossurn) bifurcatum, Swartz. 



Acrostichum (Elaphoglossurn) bifurcatum, Swartz, Synop. Fil., p. 12 ; Hook., Sp. Fil., v. p. 209 ; Roxb. 



in Beatson's St Helena Tracts, p. 296 ; Hook., 2nd Cent. Ferns, t. 91 ; Melliss, St Hel., p. 352. 

 Acrostrichum (Polybotrya) bifurcatum, Swartz; Hook, and Bak., Synop. Fil., p. 413. 

 Microstaphyla furcata, Presl, Epim. Bot., p. 160. 

 Anagramme paradoxa, Fee, Gen. Fil., p. 64. 

 Osmunda bifurcata, Jacq., Collect., iii. t. 20, fig. 2. 

 Gymnogrammc bifurcata, Kunze in Linnaea, x. p. 496. 



Darea furcans, Bory in Duperr. Voy. " Coquille," Bot. Crypt., p. 269, t. 35, fig. 2 (sterile). 

 Polybotrya furcata, Mett. ex Kuhn, Fil. Afr., p. 52. 

 Filicula cornida Insulce Sanctm Helena:, Pluken., Phytogr., t. 350, fig. 4. 



St Helena. — Endemic. On damp half-mouldered rocks near High Peak, and on the 

 rocks at Flagstaff — - Burchell, 177; wet rocks and mossy banks, abundant — Hooker; 

 without locality — Haughton ; Cuming; Nuttall; Seemann ; Lyall; Shuter ; Lefroy ; 

 Lady Dalhousie ; and Morris, in 1883. 



One of the commoner ferns of the island ; according to Melliss, thickly covering the 

 wet banks along the sides of the roads over Sandy Bay Eidge, at about 2000 feet. 



Kuhn records this fern from Ascension, collected by Durville ; but Bory cites St Helena 

 as Durville's locality. 



Acrostichum nervosum, Bory. 



Acrostichum nervosum, Bory in Duperr. Voy. " Coquille," Bot. Crypt., p. 252 ; Kuhn, Fil. Afr., p. 46. 

 Acrostichum (Olfersia) subdiaphanum, Hook, and Grev., Ic. Fil., t. 105; Hook., Sp. Fil., v. p. 225; 



Hook, and Bak., Synop. Fil., p. 416; Melliss, St Hel., p. 352. 

 Aconiopteris subdiaphana, Presl., Tent. Pterid., p. 236, t. 10, fig. 17. 

 Aconioptcris nervosa, J. Sm. 

 Acrostichum lanceolatum, Roxb. in Beatson's St Helena Tracts, p. 296. 



St Helena. — Endemic. Diana's Peak — Burchell, 179 ; trunks of trees, top of Diana's 

 Teak, rare — Hooker ; amongst the grass on the highest ridge near Diana's Peak — Haugh- 

 ton; without locality— Shuter; Nuttall; Morris, in 1883. 



One of the rarer ferns, found only in the most elevated parts of the Central Ridge. 



Melliss erroneously records it as an inhabitant of Bourbon as well as of St Helena. It 

 was originally published as a native of Madras in consequence of Dr Shuter sending it 

 thence to Sir W. Hooker without locality. 



