13. DICKSONIA, CIBOTIUM. 49 



eacli lobe, subglobose, at first entire, soon bursting with an irregular mouth and 

 breaking down into lobes and segments ; st. and main rachis glabrous. 

 Ilk.Sp. I.^.GJ./. 21.B. 



Hab. Andes of Peru. Perhaps too near some of the Andine forms of W. obtusa. _ 



GEN. 12. SPH^EROPTERTS, Watt. 



Sori globose, on the back of a vein or veinlet. Recept. large. Invol. inferior 

 globose, coriaceous, stipitate, at first enclosing the whole sorus, at length bursting 

 vertically into 2 spreading lobes or lips. TAB. I. f. 12. 



1. S. barbata, Wall. PI. Asiat. liar. 1. t. 18. HJc. Sp. 1. p. 58. Peranema, 



Don. 



Hab. Nepal, Sikhim, Khasya (Hk. f. and Thorns.}, Western Ghats of Nilghiri, 

 Beddome. Fr. 2-3 ft. 1., tripinnate. Pinnl. oblong, deeply pinnatifid, 



GEN. 13. DICKSONIA, L'Herit. 



Sori placed at the apex of a vein, intra-marginal. Invol. inferior, subglobose, 

 coriaceous or membranaceous, cup-shaped and entire, or more or less distinctly 

 2-valved. About half the species are arborescent, with large decompound coriaceous 

 fronds ; the others have creeping rhizomes, and, with two exceptions, are at least 

 fully bipinnate. They principally inhabit Tropical America and Polynesia ; but one 

 species reaches as far north as Canada, and several others are scattered throughout 

 the southern parts of the Temperate Zone. Veins in all free. TAB. II. f. 13. 



Cibotium, Kaulf. Involucre distinctly 2-valved, the outer valve coriaceous, 

 distinct from the substance of the frond. Sp. 1-5. 



1. D. (Cibotium} glauca, Smith ; arborescent ; Jr. bipinnate, ovate-lanceolate, 

 12-18 in. 1., 6-9 in. br. ; pinnL linear-acuminate, cut quite down to the rachis in 

 the lower part ; lobes linear-oblong, subfalcate ; texture subcoriaceous ; surface 

 naked on both sides, glaucous beneath ; veins prominent ; lateral veins of the 

 segments once or twice forked ; sori 2 to 12 to a lobe, inner valve oblong, nar- 

 rower than the outer.--.Hfc. Sp. Fil. 1. p. 82. t. 29. A. 



Hab. Oahu, Sandwicb Islands, discovered by Menzies eighty years ago* 



2. D. (Cibotium} Barometz, Link ; arborescent ; fr. bipinnate ; lower pinnce 

 ovate-lanceolate, 1-2 ft. 1., 6-12 in. br. ; pinnl. linear-acuminate, cut down within 

 a short distance of the rachis above, and sometimes quite down to it at the base ; 

 segm. linear-oblong, acute, subfalcate ; texture subcoriaceous ; upper surface 

 naked, shining, lower glaucous, sometimes furfuraceous ; veins prominent ; lateral 

 veins of the segments rarely forked ; sori 2 to 12 to a lobe, the valves nearly equal, 

 transversely oblong. C. "glaucescens, Hk. Sp. Fil. 1. p. 82. C. Assamicum, 

 Hk. Sp. Fil. 1. p. 83. t. 29. B. 



Hab. Assam, 8. China, Malayan Peninsula and Islands. 



3. D. (Cibotium'] Menziesii ; arborescent ; fr. bipinnate ; lower pinnae 12-18 

 in. 1., 6-9 br. ; pinnl. linear-acuminate, cut down usually not more than half-way 

 to the rachis ; lobes rounded, blunt ; texture subcoriaceous ; surface naked on both 

 sides, not glaucous beneath ; veins prominent ; lateral veins of the segments simple 

 or forked ; sori 2 to. 8, rows with a broad space between them ; inner valve nar- 

 rower than the outer, oblong. Hk. Sp. Fil. 1 . p. 84. t. 29. C. 



Hab. Oahu and Honolulu, Sandwich Islands. 



Gr 



