50 13. DICKSONIA, §§ EUDICKSONIA. 



naked on both sides, not glaucous beneath ; veins prominent ; lateral veins of the 

 segments simple or forked; son 2 to 8, rows with a broad space between them ; 

 inner valve narrower than the outer, oblon?. — UL Sp. Fil. 1. p. 84. t. 

 29. C. 



Hab. Oaha and Honolulu, Sandwich iBlanda, 



4. D. [Gibotium) Chamissoi, Hook, and Baker; _/r. tripinnate ; lower pinnce 

 ovate-lanceolate, 12-18 in. 1., 6-9 in. br. ; pinnl. linear-acuminate, cut down to 

 the rachis below ; seffm. oblong, bluntish, scarcely falcate ; texture coriaceous ; 

 under surface not glaucous, sometimes furfuraceous ; veins immersed ; lateral 

 veins of the segments usually once-forked ; sori 2 to 12 to a lobe ; valves unec[ual, 

 outer one larger, suborbicular, inner one oblong. — Hk. Sp. Fil. 1. p. 83. 



Hab. Oahu, Sandvrich Islands. 



6. 1). ( Cibotiuni) Schiedei, Baker ; fr. oblong - deltoid, tripinnate ; racMses 

 stramineous, at iirst pilose; pinnce oblong-lanceolate, 1-2 ft. 1.; pinnl. linear- 

 lanceolate, f-f in. br., short-stalked, cut down to the rachis below ; segm. close, 

 lanceolate, falcate, dentate ; texture subcoriaceous ; under surface glaucous, 

 glabrous ; venules forked, or lowest pinnate ; sori parallel with the edge, the 

 inner valve of the inv. overtopping the outer. — Cibotium Schiedei, Hk. Sp. Fil. 1. 

 p. 84. *. 30. A. 



Hab. Mexico. — Caudex 10-15 ft. high. Sori at most 4-6 to a segment, not crowded. 



§§ Eudicksonia. Involucre distinctly 2-valved,.the outer valve formed by the apex 

 of a segment. Sp. 6-17. 



6. D. arborescens, L'Herit. ; arborescent ; fr. bipinnate ; lower pinnce 12-18 

 in. 1., 6-9 in. br. ; pinnl. linear, cut down nearly or quite to the rachis; segm. 

 ^ in. 1., Jin. br., oblong ; rachises tomentose throughout, the main one densely 

 clothed at the base with linear ferruginous scales ; texture very coriaceous ; 

 fertile pinnl. often conspicuously contracted ; sari 2 to 6 to a lobe, large, globose • 

 valves transversely oblong, nearly equal. — E.k. Sp. Fil. 1. p. 66. t. 22. A, 



Hab. St. Helena, near the summit of Diana's Peak ; caudex about 10 ft. high. 



7. D. antarctica, Labill. ; arborescent ; st. under 1 ft. 1. ; scales fibrous very • 

 dense dark purple-brown ; fr. rhomboid, tripinnate, 5-6 ft. 1., 2-3 ft. br. in centre • 

 racMses stramineous, naked or slightly crinite below; central pinnce 1-1 J ft. 1. 

 4-5in.br.; pinnl. sessile, linear, | in. br. ; segm. oblong, fertile deeply inei'so- 

 pinnatifld, sterile inciso-serrate, under \ in. br. ; texture coriaceous ; both sides 

 green, glabrous; sori 6-10 to lowest segment, i lin. Tax.~Hk. 'Sp Fil ] 

 p. 66. ^ ' ' 



Hab. East Ausbraha and Van Diemen's Land. — Fully pinnate ninnse 30-40 tn a 

 frond. Caudex 30-35 ft. J v e 



8. D. dirysotricTia, Moore ; arborescent ; fr. bipinnate ; lower pinnce 12-18 in. 1., 

 6-9 in. br. ; pinnl. linear, quite cut down to the rachis except towards the apex ; 

 aegm. linear-oblong, deeply toothed, ^ in. 1., 2 lines br., bluntish ; main rachis 

 clothed with a thick coat of shining yellowish-brown hairs at the base ; rachis of 

 the pinnae and pinnules asperous and rather thickly tomentose ; texture coria- 

 ceous ; fertile pinnl, slightly contracted ; sori 2 to 6 to a lobe, ^ a line across • 



