228 CHARACTERS OF TRIBES AND GENERA. 



forked. Sori terminal, contignous, confluent, forming a 

 continuous marginal sorus. Indusium interiorly attached, 

 continuous, forming with the margin a groove, containing 

 the sporangia (as in Lindscea). 



Type. Lindscea lanuginosa, Wall. 



Illust. Hook, and Bauer. Gen. Fil., t. 102 ; Moore Ind. 

 Fil., p. 22, fig. 1 ; J. Sm. Perns Brit, and For., fig 

 79, A. 



Obs. — This genus was founded by me in 18-11, on the 

 Lindscea lanuginosa, of Wallich, a native of the Mauritius, 

 Malayan Peninsula and Islands ; to which I have since 

 added two other species also natives of the same regions. In 

 habit and general appearance Isoloma lanuginosa is similar 

 to Nephroleins ensifolia and N. hirsutiila, but differing 

 in the sori, being contiguous, forming a line on both mar- 

 gins of the pinnffi, and in having a continuous indusium 

 opening exteriorally, in that respect agreeing in technical 

 character with Lindscea, but the articulated pinnre and 

 central costa is at variance with the character of that genus. 

 Its afiinity with the present group is also indicated by its 

 having the white chalky dot, characteristic ot Ai-thropteridece. 



Sp. I. lanuginosa {Wall.) (v v.) ; I. Walkeras (iloo^'.) ; 

 I. divergens {Hook.). 



Sect. 5. — DiDTlIOCHLSNBiE. 



Caudez arboroid. Fronds bipinnate, pinnss and pinnules 

 articulate with the rachis. 



120. DiDTMOCHLENA, DeSV. (1811). 



Hook. (Sj). Fil. ; Aspidium sp. Sw. 

 Vernaiion fasciculate and erect, subarbroid. Fronds 

 bipinnate, 2 to 6 feet long, smooth, glossy ; pinnules 

 oblong elliptical, oblique, base truncate, subsessile, articu- 



