s however, is not sufficient of itself for technically distin- 
| CHARACTERS OF TRIBES AND GENERA. 
| ier adiantoides, and that again with several species — 
of Dennstedtia, a gradual transition is seen to connect all ` ` 
_ these genera. 
. Sp. D. prolifera (Hook. and Grev., t. 154; Fil. Exot, t. 
82) (v v.) ; D. concinna (Pr.) (D. Matthewsii, Hook. Sp. 
Fil., 1, t. 30, B). 
Oss.—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 HEA, (Plate 18.) 
Vernation sarmentose, slender, elongated, or short and 
. Cæspitose. Sori marginal, linear, continuous or interrupted, 
-binate or punctiform. Special indusium plane, attached on — 
_ the interior side, equal with, or shorter than the indusseform 
. margin, forming a marginal groove, or bilabiate cyst, 
| open exteriorly. | 
|. Oss.—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, 
 guishing Lindswee from the tribe Saccolomee, but their 
E 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 
