4G2 DICKSONIA. 



11*. D. Deplanchei, Vieill. ; arborescent; /r. ample, tripinnate ; racMses 

 grey-brown, asperous ; central pinnce oblong-lanceolate, 1-1| ft. 1., 5-6 in. br. ; 

 pinnl. lanceolate, nearly sessile, f-1 in. br. ; barren segm. close, ligulate-oblong, 

 inciso-crenate, or lowest subpinnatifid, 2-2^ lin. br., fertile consisting of G-10 

 sori, and tip and midrib ; texture rigidly coriaceous ; both sides green, glabrous ; 

 valves of inv. round, rigid. 



Hab. New Caledonia, Vieillard, 2248, Deplanche. 



11*. D. Brackenridgei, Mett. ; arborescent; /r. ample, tripinnate; racMses 

 naked, grey-stramineous ; central jntnice oblong-lanceolate, 12-15 in. 1., 6-7 in. 

 br, ; pinnl. sessile, lanceolate, |-1 in. br. ; barren segm. lanceolate, close, denti- 

 culate, falcate, 2-2^ lin. br., fertile llgulate, consisting only of 8-10 spaced sori, 

 ^ lin. br., and the rachis and tip ; texture rigidly subcoriaceous ; both sides 

 green, glabrous ; valves of inv. round, rigid. — Ann. Sc. Nat. ser. 4. vol. 15. p. 81. 

 D. Berteroana, Brack. 



Hab. Fiji and Samoa. — Caudex 15 feet. Fronds in most of our specimens with fertile 

 and barren pinnules mixed together in the same pinnae. 



11*. D. thyrsopteroides, Mett. ; arborescent ; fr. ample, rhomboid, tripinna- 

 tifid ; central pinna; oblong-lanceolate, 12-15 in. 1., 4-5 in. br. ; pinnl. close, 

 ascending, llgulate, sessile, \ in. br., cut down to a narrow wing ; barren segm. 

 close, ligulate-oblong, dentate, fertile reduced to rachis, and 6-8 close sori, 

 \ lin. br. ; texture rigidly coriaceous ; both sides green, glabrous ; valves of inv. 

 lirm, round. — Ann. Sc. Nat. ser. 4. vol, 15»p. 81. D. macrosora, Vieill. 



Hab. New Caledonia, Vieillard, 1634, 2209.— Caudex 24-30 feet. 



19. D. cicidaria, var. /3, incisa, Baker ; more compound than the type, with 

 inciso-dentate, lower 4-nary segments. — D. incisa, Fee, Fil. Ant. t. 25. fig, 1. 

 Dennstsedtia D'Orbignyana, Kuhn, Linn. 3(3. j9. 146. 



Hab. Tropical America. 



19*. D. He7iriett(s, Baker ; fr. deltoid, 4-pinnate ; racMses stramineous, 

 naked ; pinnce deltoid, 7-8 in. 1, ; pinnl. deltoid, distinctly stalked, reduced 

 on lower side and cuneate-truncate at base ; segm. deltoid, stalked, cuneate- 

 truncate on lower side at base, cut down to rachis into oblong blunt toothed 

 lobes with a cuneate base ; texture moderately firm ; both sides bright-green, 

 glabrous ; venides distant, erecto-patent ; sori hemispherical, placed on upper 

 side of ultimate segments. 



Hab. Antanarivo, Madagascar, Miss H. Balcer. — Most like D. cicutaria, var. incisa, 

 but pinnae and pinnules much fewer, and diminishing rapidly in size up the rachises. 



24*. D.cuneata, Hk. ; fr. ample, subdeltoid,4-pinnatifid; rfl!c7;«sc5 stramineous, 

 naked ; pinnce lanceolate, -^-l ft. 1. ; pinnl. close, sliort-stalked, lanceolate, 

 §-^ in. br. ; segm. oblong-rhomboid, 1-2 lin. br., inciso-pinnatifid, cuneate at 

 base, sessile, more cut away on lower side ; texture moderately firm ; both sides 

 green, glabrous ; veins subflabellate ; sori at base of ultimate sinuses ; inv, cup- 

 shaped, glabrous — Hk. Sp. I. p. 80. t. 28. C. 



Hab. Philippines, Cuming. 



25*. D. samoensis, Baker; /?'. ample, 4-pinnatifid ; rachises thinly pilose; 

 lower ^:»M2?;a? 1 ft. or more 1., lanceolate- deltoid ; pinnl. and segm. close, lan- 

 ceolate-deltoid, distinctly stalked, cuneate-truncate on lower side at base ; 

 4-nary lobes close, ol)long, blunt, ^-1 lin. br., crenato-pinnatifid ; texture mem- 

 branous ; ribs beneath hairy ; sori minute, placed at base of ultimate sinuses ; 

 valves of inv. equal, hemispherical, glabrous. — Sitolobium samoense. Brack, 

 Fil. Amer. Exp. p. 274. t. 88. fig. 1. 



Hab. Samoa, BracJccnridf/e. 



