CHARACTERS OF TRIBES AND GENERA. 
glossy, rarely flaccid, from 6 inches to 3 feet high. Veins | 
forked, venules free ; fertile venules sometimes very short, 
dentiform. Sori terminal. Receptacle punctiform.  Spor- 
angia vertical, included within an urceolate or tubular indu- 
sium. 
Type. Davallia canariensis, Smith. 
Fil, p.75 B.; J. Sm. Ferns Brit. and For., fig. 3; 
Hook. Syn. Fil., t. 2, fig. 18, c. 
Species, widely distributed over the Eastern Hemisphere, 
the extreme western limits being the Azores and Canary 
Islands. It differs from Humata in having the indusium ` 
attached by its base and sides, impressed in the substance 
of the fronds, thus forming an urceolate tubular cyst. — 
Ex.—D. triphylla, Hook. ; D. pentaphylla, Bi. ror. 
bullata, Wall. (v v); D: mauritiana, Hook; D. fijiensis, — 
Hook. ; D. solida, Sw. (vv.); D. ornata, Wall. (v v.) ; D. 
pyxidate, Cav. (v v.); D. divaricata, Bl. (v v.); D. elata, 
| Bw. (v v.) CD. elegans, Sw. (v v.) ; D. pallida, Mett. (v v) ; 
- D. nitidula, Kze. (v v.) ; D. Vogelii, Hook. (v v. ); D. canari- 
ensis, Sm. (v v.) ; D. dissecta, J. Sm. (v v.). 
4.—LDxvcosrEGnA, Presl (1836). 
Davallia, sp. Hook. Sp, Fil. ; Acrophorus, Moore. 
Surculum slender, or short and thick (hypogeous in $. 
immersa). Fronds lanceolate, bipinnatifid, or deltoid-mul- DE 
-tifid, generally membraneous and flaccid, from 2 inches to = 
2%} feet high, smooth, rarely pilose, the ultimate divisions _ S 
: mostly bifid and soriferous below the sinus. Veins : S 
ked ; venules free, the anterior ones often very short. i 
Sori terminal, de | Receptacles ee = 
Illust.—Hook and Bauer, Gen. Fil, t. 27; Moore Ind. - 
Oss. This genus consists of about a dozen or more — 
