258 CHAEACTEES OF TEIBES AND GENEEA. 



and is represented in 'New Grenada, Venezuela, Brazil, 

 and Jaraaica by B. coniifolium, wliicli I consider to be 

 scarcely distinct from the preceding. 



Sp. B. Culcita {L'Herit) (v v.) ; B. coniifolium {Hook.) 



140.— Ctstodium, J. Sm. (1841). 

 DicJcsonia, Sm., Hook. Sp- Fil. 



Vernation fasciculate, erect, sub-arboroid ? Fronds stipate, 

 bipianate, 2 to 3 feet long ; pinnas distant, 1 foot long, 

 pinnnlea linear lanceolate, acuminate, dentate, snb-auricu- 

 lated, truncate at tbe base, articulate with the raohis. Veins 

 simple or forked, parallel, their apices free, terminating in 

 the marginal dents, and sporangiferous ; accessory inclusium 

 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. Dichsonia sorbifolia, Sm. 



lUust. Hook, and Bauer Gen. Fil., t. 96. 



Obs. — This genus is founded on a very rare Fern, first 

 described by Sir J, E. Smith in Bee's Cyclopredia, 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 acauloae or arboroid vernation. 

 The marginal bivalved indusia agrees with some Dichsonia 

 such as Gihotium, but its simple lanceolate pinns being 

 articulate with the rachis, seems to indicate its relationship 

 to be with the section Arthropterece of Aspidece rather than 

 with any genus of Biclcsonia, but till more is known of it, 

 I place here. 



Sp. 0. sorbifolium (Sm.) {Hook. Sp. Fil, 1, t. 25 A) 



