154 VASCULAR PLANTS. 



2 Nothochlaena, B. Br. 



Sporangia collected into a marginal, some- 

 what interrupted line, covered with hairs. In- 

 dusium 0. 



U . fronds hirsute. 



3. Cheilanthes, Swartz. 



Sori placed separately at the end of veinlets. 

 Spurious indusium rudimentary, formed by the 

 reflexed margin of the frond. 2£ . 



4. AllosurilS, Benth. (Pellcea, Link.) 



Sporangia on veins oblique to the midrib. 

 Spurious indusium continuous, formed by the 

 reflexed margin of the frond. 



2£. glabrous, coespitose; fertile fronds con- 

 tracted; petioles not green. 



5 Poly podium, L- 



Sori round, placed on the veins. Indusium. 

 0. If. 



6. Pteris, L 



Sporangia at the end of the veinlets, con- 

 nected into a vein-like receptacle which sur- 

 rounds the frond without interruption. Indu- 

 sium continuous, membranaceous; attached at 

 its marginal, free on its inner side. IX . 



