258 . CHARACTERS OP TRIBES AND GENERA. 
. and is represented in New Grenada, Venezuela, Brazil, 
. and Jamaica by B. coniifoliwm, which I consider to be 
. scarcely distinct from the preceding. 
Sp. B. Culcita (Z’Herit) (v v.) ; B. coniifolium (Hook.) 
140.—Cystoprum, J. Sm. (1841). 
Dicksonia, Sm., Hook. Sp. Fil. 
Vernation fasciculate, erect, sub-arboroid ? Fronds stipate, 
bipinnate, 2 to 3 feet long; pinns distant, 1 foot long, 
pinnules linear lanceolate, acuminate, dentate, sub-auricu- 
lated, truncate at the base, articulate with the rachis. Veins 
simple or forked, parallel, their apices free, terminating in 
„the marginal dents, and sporangiferous ; accessory indusium 
concave, vaulted and conniving with the smaller, plane - 
special indusium, the two together forming an unequal, 
bivalved cyst, forming a row of marginal denteform sori. 
Type. Dicksonia sorbifolia, Sm 
Illust. Hook. and Bauer Gen. Fil., t. 96. 
Ozs.—This genus is founded on a very rare Fern, first 
described by Sir J. E. Smith in Ree's Cyclopsdia, from — 
Specimens collected in the Island of Honimoe, Moluccas, by ` 
|... Christopher Smith, between seventy and eighty years ago. 
It appears not to have been since collected, as only three or _ 
four specimens are to be found in herbaria in this country, - 
and these consist of portions of fronds only, and nothing-is 
known as to whether it has acaulose or arboroid vernation. um 
PU. "The marginal bivalved indusia agrees with some Dicksonia | 
. Such as Cibotium, but its simple lanceolate pinnse being — 
_ articulate with the rachis, seems to indicate its relationship — 
to be with the section Arthropteree of Aspidew rather than — 
with any genus of Dicksonia, but till more is known of e 
I place here. a 
Sp. C. sorbifolium (Sm.) (Hook. Sp. Pix 1, t. 25 A) 
