84 



CHAKACTEES OF TEIBES AND GENERA. 



Indusium snb-reniform, oblong- or nearly orbicular, 

 plane, interiorily attached by its base, and partly by 

 its sides, equal with, or shorter than the margin, thin, 

 scariose. 



Type. BavalUa immersa, Widl. 



lUust. — Hook and Bauer, Gen. Fil, t. 62, A ; Moore, Ind. 

 Fil., p. 73, B. ; J. Sm., Ferns Brit, and For., %. 4. 



Obs. — This g-envis as founded by Prcsl consisted of only 

 one sjjecies, namely DavaUla immersa of Wallich, which has 

 pale deciduous fronds, rising- from a hypogeous creeping 

 candex. Although the character of the sori differs little 

 from that of Hiimata, its distinct habit does not allo-sv it to 

 1)6 associated -nrith that genus or with Davcdlia ; which is 

 also the case with other species of Davallia of authors, which 

 I here place under Lettcustegia. They ai-e widely distributed 

 throughout the same countries as those of the preceding-. 



Sp. — L. parvula {Wall.) (v v.) ; L. falcinella (Pc.) ; L. 

 afifinis (Hooh.) (v v.) ; L. GrifEthiana [Hooh.) ; L. chasro- 

 phylla {Wall.) (v v.) ; L. pulchra (Don.) (v v.) ; L. immersa 

 (Pr.) (v V.) ; L. membranulosa (Wall.); L. hirsuta (/. Sm.) 

 (v V.) ; L. bornoensis (J. Sm.) {Nephrodium, IIooJc.) ; 

 L. assamica (v v.) {Bedd. F. Brit. Ind. Fil. 94). 



Obs. — In Moore's " Index Filicum," the above species 

 are all jolaced in the genus Acrophorus of Presl, which is 

 founded on Aspidlum nodosum of Wallich, a large growing 

 Pern of joeculiar habit, and having no natural affinity with 

 the species of Lcucosterjia, its vernation being adherent and 

 fasciculate (see Acropliorus) . 



* * Sori destitute of Indiisium. 



Tribe 3.— POLYPODIES. (Plate 3.) 

 Veins free or anastomosing in various ways. Sori 



