266 CHAEACTERS OF TRIBES AND GENERA. 



Microlepia adiantoides, and that again with several species 

 of Dennstcedtia, a gradual transition 'is seen to connect all 

 these genera. 



Sp. D. prolifera (Hook, and Grev., t. 154 ; Fil. Exot., i. 

 82) (v v.) ; D. concinna (Pr.) (D. Matthewsii, HooJc. Sp. 

 Fil, 1, t. 30, B ). 



OBS. The latter species is a native of Peru. In the 

 " Synopsis Filicum " another species is described, namely, 

 D. Moorei, which, although agreeing in having an exserted 

 cup-like indusium, is nevertheless quite distinct in habit 

 and venation. In this work it is characterised as a genus 

 under the name of Trichiocarpa. 



Tribe 18. LINDS^E^B. (Plate 18.) 



Vernation sarmentose, slender, elongated, or short and 

 ceespitose. Sori marginal, linear, continuous or interrupted, 

 binate or punctiform. Special indusium plane, attached on 

 the interior side, equal with, or shorter than the indusaeform 

 margin, forming a marginal groove, or bilabiate cyst, 

 open exteriorly. 



OBS. A very interesting tribe of Ferns, in many res- 

 pects similar in habit to Adiantum, but readily distinguish- 

 able by the indusium being attached on the interior side of 

 the receptacle, and open exteriorly. This character, 

 however, is not sufficient of itself for technically distin- 

 guishing Lindsceece from the tribe Saccolomece, but their 

 distinct habit marks them as representing a separate 

 group. 



About sixty species are described in the " Species 

 Filicum," which in the " Synopsis " are reduced to forty- 

 eight ; from that number I exclude the species constituting 



