100. imccES. 443 



[11. Gtmnogbammb. Clusters oblong or linear on both 

 branches of the forked vein, becoming confluent and corer- 

 ing the back of the frond. Indusium wanting.] 



Tr. rv. ADIANTEjS. Capsules covered by a marginal or 

 submarginal elongated part of the frond, or by a separated 

 portion of the cuticle resembling an indusium. 



12. Blbchnum:. Capsules in a continuous line parallel to 

 the midrib upon a longitudinal anastomosing part of the 

 transverse vems, covered by a continuous scanous indu- 

 sium. — Barren and fertile fronds dissimilar in our plant. 



13. Pteris. Capsules in a continuous marginal line covered 

 by a contuiuoua indusium formed of the reflexed margin. 



14. Adiantum. Capsules marginal, oblong or roundish, 

 covered by distinct reflexed portions of the margin of the 

 frond. 



tt Capsule opening irregularly, seated on a receptacle which ends 

 a vein at the edge of the frond. Ring obliqiie, transverse, 

 complete. 



Tr. V. HTMENOPHYLLE^. 



15. Thichomanbs. Capsules on a long flUform receptacle 

 within a cupshaped involucre of the same texture with the 

 frond. 



16. HYMENOPHVXLtrM. Capsules on a narrow subclavate 

 receptacle within a two-valved involucre of the same texture 

 with the frond. 



** Capsules loithout an elastic ring. 



Suborder n. OSMUND AOE^. 



Young fronds circinate. Rachia woody. Capsules regularly 

 2-valved, stalked, in clusters at the extremity of the frond. 



Tr. VI. OSMUKDE^. 



17. OsMTTNBA. Capsules clustered, arranged in a branched 

 spike terminating the frond. 



Suborder IH. OPHlOGLOSSACEiE. 



Toung fronds straight. Kachis succulent. Capsules regularly 

 g-valved, sessile, in clusters on a separate branch of the frond. 



