APPENDIX. 353 



Gen. S.Athyrium. Veins primate. Sori straight, curved, 

 or reniform, but attached by a linear edge. 



Gen. 10. Blechuum. Sori marginal, somewhat conflu- 

 ent. Indusium opening inwards. 



Gen. 11. Doodia. Veins parallel, anastomosing slightly. 

 Sori lunate or linear, in one or two rows parallel with 

 midrib. Indusium flat. 



Gen. 12. \Yoodwardia. Veinlets form hexagonal meshes. 



O 



Sori lunate or linear, parallel with midrib in one row. 

 Indusium convex, immersed. 



Gen. 13. Cystopteus. Indusium suborbicular, fixed by 

 a lateral inferior point. 



Gen. 14. Onoclea. Fertile pinnae contracted into glob- 

 ules. Indusium lunate, attached on a short horizontal 

 veinlet. 



Tribe 10. Aspidiece. Sori subglobose. Indusium with 

 central or eccentric point of attachment, free all round. 



Gen. 1. Lastrcea. Indusium reniform. Veinlets free 

 at ends. 



Gen. 2. Nephrolepis. Indusium reniform. Sori on tips 

 of upper veinlets. Petioles articulated with the rachis. 



Gen. 3. Nephr odium. Indusium reniform, veinlets in- 

 osculating. 



Gen. 4. Aspidium. Indusium orbicular, peltate. Veins 

 branched, anastomosing hexagonally, with free veinlets. 



Gen. 5. Polystichum. Indusium orbicular, peltate. Sori 

 on middle of veins below the bifurcations. 



Gen. 6. Sagenia. Indusium orbicular, peltate. Vein- 

 lets anastomosing hexagonally without free ringlets. 



Gen. 7. Fadyenia. Indusium cordate. Sori apical, bi- 

 seriate. Vein4ets reticulate. 



Gen. 8. Didymochlcena. Indusium oblong-elliptic, fixed 

 in the middle by a longitudinal crest. 



Gen. 9. Matonia Indusium orbiculate, peltate, umbo- 

 nate, the margins deflexed, covering about six sporanges. 



23 



