352 THE MICROSCOPIST. 



Gen. 3. Cystodium. True indusium plane, false one 

 hoodlike. 



Gen. 4. Thrysopteris. Sori semiglobose. Indusium cup- 

 like. Sori on a thryse (leaf without parenchyma). 



Gen. 5. Deparia. Sori as in 4. Parenchyma of leaf 

 developed. 



Tribe 8. Davalliece. Sori apical, inframargiual. Indu- 

 sium one-valved. 



Gen. 1. Davallia. Sori globose. Indusium cup-shaped, 

 the mouth truncated. Veins primate. 



Gen. 2. Lindscea. Sorus linear, continuous. Indusium 

 parallel with leaf margin, free outside. Veins dichoto- 

 mous. 



Gen. 3. Dictyoxyphium. Sorus and indusium as in 2. 

 Veins anastomosing with free venules. 



Gen. 4. Schizoloma. Sorus and indusium as in 2. Veins 

 anastomosing in hexagonoid meshes. 



Tribe 9. Aspleniece. Sori on veins. Indusium persist- 

 ent, lateral, the margin free. 



Gen. 1. Scolopendrium. Veins primate. Sori linear, in 

 pairs on adjacent sides of two parallel veinlets. 



Gen. 2. Antigramma. Veins primate, veinlets anasto- 

 mosing. Sori linear, in pairs facing together. 



Gen. 3. Campto&orKS. Veins as 2. Sori elongated, di- 

 verging. 



Gen. 4. Diplazium. Veins primate, veinlets free. Sori 

 linear, in pairs back to back. 



Gen. 5. Oxygonium. Veins primate, veinlets anasto- 

 mosing at the ends. Sori as 4. 



Gen. 6. Asplenium. Veinlets free. Sori linear, single 

 on back of vein or veinlet. 



Gen. 7. Ceterach. Indusium replaced by scales. Sori 

 linear on back of veins. 



Gen. 8. Neottopteris. Veinlets anastomosing at ends. 

 Sori linear, single. 



