13. DICKSONIA, EUDICKSONIA. 51 



subfalcate ; mainrachis usually smooth above, densely tomentose and subasperous 

 below ; texture coriaceous ; fertile pinnl. slightly contracted ; sori 2 to 6 to a 

 lobe, \ a line across ; valves suborbicular. Hk. Sp. Fil. 1. p. 67. t. 22. B. B. Kar- 

 stenianum, Klotzsch. 



Hab. Tropical America, from Guatemala southward to Brazil and Peru. Caudex 

 15-30 ft. high, 1 ft. thick ; " stipes -2 ft. 1., so densely clad with long fulvous hairs, 

 changing to brown or blackish, as to precisely resemble the thighs of the howling 

 monkey . " Spruce. 



10. D. squarrosa, Swartz ; arborescent ;fr. bipinnate ; lower pinnae 12-18 in. 1., 

 C-9 in. br. ; pinnl. of the barren frond linear-acuminate, cut down within a short 

 distance of the rachis above, quite to it below ; segm. % in. 1., | in. br., with close 

 mucronate teeth reaching about half-way down ; rachis rough with raised points, 

 densely clothed below with long, shining, light-brown hairs ; second, rachis also 

 dark-brown and asperous; texture coriaceous ; fertile pinnl. much contracted, cut 

 down nearly to the rachis ; sori 2 to 12 to a lobe, -f line across ; valves subor- 

 bicular. HL Sp. Fil. 1. p. 08. 



Hab. New Zealand ; Richmond Kiver, N. S. Wales, C. Moore (D. Youngice, C. Moore, 

 MSS.). "Trunk attaining 10-12 ft., slender, never more than 4 in. in diameter" 

 (C. Moore). Fronds about 1 yrd. 1., \ yrd. across. 



11. D. Berteroana, Hk. ; arborescent ;fr. bipinnate ; lower pinnce 1 ft. 1., about 

 6 in. br. ; pinnl. of the barren frond linear-acuminate, cut down to the rachis except 

 at the very apex ; segm. ^-f in. 1., ^ in. br., subfalcate, nearly entire or broadJy 

 and bluntly toothed ; texture coriaceous ; rachis nearly naked, slightly asperous ; 

 fertile segm. consisting only of 2 to 8 stipitate sori with hardly any connecting 

 membrane ; valves of the invol. suborbicular, nearly equal. Hk. Sp.Fil. I. p. 67- 

 t. 23. A. D. thyrsopteroides, Mett. 



Hab. Juan Fernandez, Samoa, Fiji, and New Caledonia. Trunk attaining a height 

 of 15 ft. This and the five preceding form a well-marked natural group, to which 

 J. Smith restricts the name Dicksonia ; but the present is very distinct by the character 

 of the fertile frond, connecting the others with Thyrsopteris ; but here sometimes there 

 are barren and fertile segments in the same pinnule. 



12. D. Culcita, L'Herit. ; roots from a thick rhizome, densely clothed with 

 shining ferruginous hairs ; jr. 12-18 in. 1,, 1 ft. br., tripinnate ; lower pinnl. del- 

 toid, their divisions ovate, cut down to the rachis in the lower part, with oblong- 

 rhomboidal unequal-sided deeply-toothed segments, which are cuneate at the base 

 on the lower, truncate on the upper side ; texture subcoriaceous ; rachises nearly 

 naked ; both surfaces naked ; fertile fr. so much 'contracted that there is very 

 little membrane between the sori, which are 1 line across, with reniform sub- 

 equal valves. Hk. Sp. Fil. 1. p. 70. Balantium, Kaulf., J. Sm. 



Hab. Madeira and the Azores ; so abundant that the dense woolly covering of the 

 rhizome has now become an article of commerce. 



13. D. coniifolia, Hk. ; fr. tripinnate ; lower pinnce 12-18 in. L, 12 in. br. ; 

 lower divisions of the pinnl. deltoid-acuminate, their segments cut down nearly 

 to the rachis, with ovate-rhomboidal, bluntish, deeply-tootbed lobes ; texture her- 

 baceous ; upper surface naked, lower and the rachises slightly hairy ; sori 2 to 8 

 to a lobe, a line across ; valves equal, reniform, several times broader than deep. 

 Hk. Sp. Fil. 1. p. 70. t. 24. A. D. Martiana, Klot. Hk. Sp. Fil. 1. p. 70. 

 t. 24. B. 



Hab. Jamaica and Columbia, southward to Brazil. A much more divided plant than 

 any of the preceding, with sharply-cut acute ultimate segments, not more than |-| in. J., 

 | in. br. 



14. D. dubia, Gaud. ; fr. tri-quadripinimte ; lower pinnce 1-2 ft. L, 1 ft. br. ; 



