228 CHARACTERS OF TRIBES AND GENERA. 



forked. Sori terminal, contiguous, 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. Ferns Brit, and For., fig 

 79, A. 



OBS. This genus was founded by me in 1841, 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 Nephrolepis ensifolia and N. hirsutula, but differing 

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

 gins of the pinnae, and in having a continuous indusium 

 opening exteriorally, in that respect agreeing in technical 

 character with Lindscea, but the articulated pinnae and 

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

 Its affinity with the present group is also indicated by its 

 having the white chalky dot, characteristic of Arthropteridece. 



Sp. I. lanuginosa (Wall.} (v v.) ; I. Walkera) (flbofc.) ; 

 I. divergens (Hook.). 



Sect. 5. DIDYMOCHL^NEJ;. 



Caudex arboroid. Fronds bipinnate, pinnae and pinnules 

 articulate with the rachis. 



120. DIDTMOCHL^NA, Desv. (1811). 

 Hook. Sp. Fil. ; Aspidium sp. Sw. 



Vernation fasciculate and erect, subarbroid. Fronds 

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

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



