460 CXLIII. FILICES. 



occupying the whole under surface of tlie nar- 

 rowed segments of a modified (fertile) frond . 17. Lomaeia. 



Tribe 6. BLECnNE.T;. Sori and involucres linear, parallel to the edge of 

 the frond, but not close to it. 

 The only genus 18. Blechnum. 



Tribe 7. Asplenie^. Sori and involucres linear or oblong, running 

 down the veins. 

 The only genus 19. Asplenium. 



Tribe 8. Aspidieje. Involucre placed over the sorus, globose or oblong. 



Involucre large, elliptical, attached to a linear re- 

 ceptacle 20. D1DYMOCHL.ENA. 



Involucre orbicular, peltately attached . . . .21. Aspidium. 



Involucre reniforra, attached by the sinus. Pinnae 



divided and not articulated at the base . . .22. Nepheodiuji. 



Involucre reniform. Pinnae simple, articulated at 



the base 23. Nepheolepis. 



Involucre reniform. Frond quite simple . . . 24. Oleakdea. 



Tribe 9. Eupolypodie^. Sori without an involucre, globose or rarely 

 suboblong. 

 The only genus 25. Polypobium. 



Tribe 10. Geammitide.e. Sori linear or linear-oblong, without an in- 

 volucre. 

 Frond simple, like leaves of grass. 



Fronds with a midrib only 26. Monogeamme. 



Fronds with copious veins in addition to the 



midrib 27. Yittaeia. 



Fronds compound, orbicular or ovate. 



Sori marginal 28. Notochl^na. 



Sori running down the veins 29. Gymnogeamme. 



Tribe 11. Aceostiche^. Sori spread over under surface of the frond. 

 The only genus 30. Aceostichum. 



Suborder 4. Osxuundese. Vernation circinate. Capsules with an in- 

 complete horizontal ring, opening at the apex. 

 Fructification in special thyrsoid clusters (modified 



portions of the frond) 31. OsMUNDA. y 



Fructification on the back of the leafy part of the 



frond 32. Todea. 



Suborder 5. Schizsese. Yernation circinate. Capsules opening down 

 the side, crowned with a small, complete ring. 



Capsules in special distichous sj^ikes 33. Schizjja. 



Capsules in special dense thyrsoid clusters . . . 34. Anemia. 

 Capsules on the back of the leafy part of the frond 35. Moheia. 



Suborder 6. Marattiese. Yernation circinate. Capsules concrete in 

 boat-sliaped masses in the only Cape genus . . . 36. Maeattia. 



Suborder 7. Ophioglossese. Yernation not circinate. Capsules deeply 

 2-valved, without a ring, forming a dense, 2-ranked spike in the only Cape 

 genus 37. OpuiOGLOSSUM. 



