CHARACTERS OF TRIBES AND GENERA. 197 



The sarmentum of D. WallicJiii is described as being 

 hypogeous. 



** Sori indusiate. 



Sect. 2. ASPIDEJ;. 



Sori normally punctiform. Indusium orbicular peltate, 

 or lateral interiorly attached, and then more or less reni- 

 form, rarely calyciform. 



A. Indusium calyciform. 



101. HYPODERRIS, E. Br. (1830). 



Vernation uniserial sub-sarmentose. Fronds simple, 

 entire or trilobed, 1 to 2 feet long. Primary veins 

 costseform ; venules compound anastomosing. Receptacles 

 punctiform, compital, included within a calyciform obscure 

 membraneous indusium. Sori round, irregular or oblique 

 biserial between the primary veins. 



Type. Hypoderris Brownii, J. Sm. 



Illust. Hook, and Bauer, Gen. Fil., t. 1 ; Hook. Gard. 

 Ferns, t. 24 ; Moore Ind Fil. p. 83 A. ; J. Sin. Ferns, 

 Brit, and For., fig. 72 ; Hook. Syn. Fil., t. 1, fig. 10. 



OBS. This genus was, until lately represented by a 

 single species, as yet found only in the Island of Trinidad, 

 West Indies. It is so similar in habit and venation with 

 Dryomenes and Podopeltis, that without a very close exami- 

 nation of its sori it would pass for a species of Dryomenes, 

 allied to D. plantaginea, but the sori are found to be 

 furnished with a small membraneous calyciform indusium, 

 similar to that of Woodsia. 



In the " Species Filicum " it is placed in the Tribe 

 DicksonicB, with which it has no affinity either in habit, 

 venation, or position of the sori. 



