CHARACTEES OF TRIBES AND GENERA. 255 



distinguished by the sori being terminal and marginal, as 

 also by the fronds before evolution being densely crini- 

 ferous, the hairs being long and articulated, thus differing 

 from Cyathea, which instead of hairs, are furnished with 

 squamae. 



Sp. D. arborescens, L'Herit. (v v.) ; D. chrysotricha, 

 Moore. (Balantium, Hassk.) ; D. squarrosa, Sw. (v v.) ; 

 D. fibrosa, Colenso ; D. Sellowiana, Hook (v v.) ; D. 

 Berteroana, Hook ; D. lanata, Col. ; D. Youngii, C. Moore 

 (v v.)- 



137. CIBOTIUM, Kaulf. (1824.) 

 Dicksonia, sect. Cilotium, Hook., Sp. Fit. 



Vernation fasciculate, decumbent or erect, and arbores- 

 cent, densely criniferous. Fronds bipinnate, 5 to 15 feet 

 long ; pinnules bipinnatifid, generally glaucous beneath. 

 Veins simple, forked or pinnate, venules free. Receptacles 

 punctiform, terminal. Indusium bivalved, horny, the outer 

 valve (accessary indusium) concave, cucullate, adnate to the 

 margin ; the inner (special indusium.) smaller, and con- 

 niving with the outer, forming an unequal bivalved box- 

 like cyst. 



Type. Dicksonia glauca, Smith. 



Illust. Hook, and Bauer, Gen. Fil., t. 25 ; Moore, Ind. 

 Fil., p. 78 B. ; J. Sm., Ferns, Brit, and For., fig. 128 ; 

 Hook. Syn. Fil., t. 2, fig. 13, a. b. 



OBS. This is a very distinctly marked genus, readily 

 distinguished from Dicksonia and its allies by the outer 

 valve being special, and formed on the reflexed margin 

 of the frond as in Dicksonia, but superficially seated on 

 the edge of the segments, rising from the outer base of the 

 receptacle, and conniving with the interior special indu- 



