CHARACTERS OF TRIBES AND GENERA. 265 
vernation marks them as a distinct group from the arbo- 
rescent Dicksonia. The genus consists of about twenty 
species, widely distributed in the tropics and sub-tropical 
regions of both hemispheres, extending to New Zealand in 
the south and Canada and Japan in the north. In the 
“Species Filicum” thirty species are described, but many 
of them are very doubtful as true species. 
Sp. D. obtusifolia ( Willd.) ; D. adiantoides (H. B.) (v v.); 
D. cicutaria (Sw.) (v v.); D. dissecta ($w.) (v v.); D 
apiifolia (Sw.); D. rubiginosa (Kaulf.) (v v.) ; D. anthris- 
eifolia (Kaulf.) (v v.) ; D. davallioides (R. Br.) (v v); 
D. straminea (Lab.); D. cuneata (Hook.); D. appendicu- 
lata ( Wall.) ; D. punctiloba (Sw.) (v v.) ; D. strigosa (Sw ) ; 
D. Moluccana (Bi.) (v v.); D. flaccida (Bernh.) ; D. Pavoni 
(Hook.) (v v.) i; 
147.—Dz»an1a, Hook. and Gren, (1836). 
Hook. Sp. Fil. 
Vernation sub-fasciculate, decumbent. Fronds bipinnati- 
fid, 1 to 2} feet long. Veins pinnate; venules free. Recep- 
tacles punctiform, terminal. Sori exserted ; special and C = 
accessory indusia conniving, and forming a calyciform 
pedicellate exserted cup, containing the sporangia. 
Type. Dicksonia prolifera, Kaulf. 
Illust Hook. and Bauer, Gen. Fil., t. 44, B. ; Moore Ind. 
Fil, p. 79 B. ; J. Sm. Ferns Brit. and For., fig. 124; 
Hook. Syn. Fil, t. 2, fig. 14. 
Oss.—This genus is founded on a Fern, a native of the 
Sandwich Islands, and, in aspect, differs from the rest of 
the alliance, the habit being more analogous to Athyrium 
in the tribe Aspleniem. The exserted pateriform sorus ` 
"dee it from EE but on comparing it with ie 
