APPENDIX. 351 



Gen. 1. Vittaria. Sori solitary. Fronds ribbonlike or 

 grassy. 



B. With an indusium. 



Tribe 6. Adiantece. Sori linear, marginal, at apices of 

 veins. Indusium spurious, formed by revolute margin. 



* Sori on the notches of the fronds. 



Gen. 1. Lonchitis. Veins anastomosing. Sori linear, 

 semilunate. Indusium marginal, semilunar. 



Gen. 2. Hypolepis. Veins primate. Sori sub-globose, 

 on inferior border of teeth of frond. Indusium margi- 

 nal, semilunar. 



* * Sori on margin of the frond. 



Gen. 3. Lomaria. Veins primate, forked ; fertile fronds 

 narrower. Sorus linear, continuous. 



Gen. 4. Pteris. Veins primate. Sorus continuous. 



Gen. 5. Amphiblestra. Primary veins strong. Venules 

 anastomosing in hexagonal spots. Sorus linear. 



Gen. 6. Litobrochia. Veins anastomosing hexagonally. 

 Sorus linear. 



Gen. 7. Allosorus. Veins primate. Sori at first roundish, 

 then confluent and linear, covered by the reflected margin. 



Gen. 8. Cassebeera. Veins primate. Sori two under 

 each notched tooth of the leaf. 



Gen. 9. Adiantum. Veins fan-primate. Sori linear or 

 semilunar, free within. 



. Gen. 10. Hewardia. Veins reticulated. Sori linear. 

 Indusium linear or semilunar. 



Gen. 11. Cheilanthes. Veins primate. Sori sub-globose, 

 minute, covered by reflexed apex of tooth and the indu- 

 sium. 



Tribe 7. Dicksoniece. Sori globose, apical. Indusium 

 lateral, two-valved. 



Gen. 1. Dicksonia. Valves of indusium unequal. 

 Gen. 2. Cibotium. Valves nearly equal. 



