82 CHARACTEKS OF TRIBES AND GENERA. 



three following- genera. They are all natives of the Old 

 World, not being- represented in America. 



2. HUMATA, Cav. (1801.) 

 Davallia in part ; Smith and oilier authors. 



Surculum slender. Fronds linear, lanceolate, entire, 

 sinuose, pinnatifid, or deltoid bipinnatifid, rigid, glossy, 

 rarely squamose, 4 to 12 inches in height. Veins simple or 

 forked, free, often thickened upwards. Sori marginal or 

 antimarginal. Receptacles punctiform. Indusium sub- 

 rotund, or reniform, entirely attached by its generally 

 broad base, shorter or equal with the margin, forming a 

 bilabiate firm cyst. 



Type. Davallia pedata, Smith. 



Illust. Hook and Bauer, Gen. Fil., 1. 114 A ; Moore, Ind. 

 Fil., p. 74. ; J. Sm., Ferns Brit, and For., fig. 2 ; 

 Hook. Syn. Fil., t. 2, fig. 18, a. b. c. 



OJBS. This genus consists of about a dozen species, 

 natives of the Malayan, Philippine, and Asian Islands of 

 the Pacific Ocean. It is distinguished from true Davallia 

 by the indusium being attached by its interior base only. 



Ex. H. angustata, Wall. ; H. heterophylla, 8m. (v v.) ; 

 H. pectinata, Sin. ; H. parallela, Wall. ; H. pedata, Sm. 

 (v v.) ; H. sessilifolia, Bl. H. Cumingii, Hook, (v v.) ; 

 H. vestita. Bl. ; H. Tyermani, Moore (App. Hook. Syn. Fil.). 



3. DAVALLIA, 8m. in part (1793). 

 Davallia in part, Hoolc. Sp. Fil. 



Surculum creeping, or sub-erect and sub-frutescent. 

 Pfonds pinnate, bipinnate or deltoid multifid, firm and 



