CHARACTERS OF TRIBES AND GENERA. 
Indusium ‘sub-reniform, oblong or nearly ` orbicular, 
plane, interiorily attached by its base, and partly b 
its sides, equal with, or shorter than the margin, 
 Scariose. 
Type. Davallia immersa, Wall. 
Illust.-—Hook and Bauer, Gen. Fil, t. 59, A ; Moore, Ind 
Fil., p. 73, B. ; J. Sm., Ferns Brit. and For. fig. 4. ` 
Oss.—This genus as founded by Presl consisted of only 
one species, namely Davallia immersa of Wallich, which has 
pale deciduous fronds, rising from a hypogeous creeping 
caudex. Although the character of the sorj differs little 
from that of Hwmata, its distinct habit does not allow it t 
be associated with that genus or with Davallia ; which is 
also the case with other species of Davallia of authors, which 
I here place under Leucostegía. They are widely distributed. 
throughout the same countries as those of the precedi 
Sp.—L. parvula (Wall.) (v v.); L. falcinella (Pr.) ; 
. affinis (Hook.) (v v.) ; L. Griffithiana (Hook.); L. c ær 
 phylla ( Wall.) (v v.) ; L. pulchra (Don.) (v v.); L. immers 
Pe) (ev): Dc merliranüloss (Wall.); L. hirsuta (J. S. 
(vv.); L, borneensis (J, Sm.) (Nephrodiwm, Hook. 
L. assamica (v v.) (Bedd, F. Brit. Ind. Fil. 94). — 
. Oss.—In Moore's “ Index Filicum,” the above speci 
are all placed in the genus Acrophorus of Presl, which 
founded on Aspidium nodosum of Wallich, a large growin 
Fern of peculiar habit, and having no natural affinity with 
_ the species of Leucostegia, its vernation being adherent 
fasciculate (see Acrophorus), ` TRI T 
* $ Sori destitute of Indusium. 
à 5 i ge Tribe 8.—POLYPODIEJE.. (Plate 8) e 
Vein freo or anastomosing in various we 
