460 CXLIII. FILICES. 
occupying the whole under surface of the nar- 
rowed segments of a modified (fertile) frond . 17. Lomaria. 
Tribe 6. BrrcHnem®. Sori and involucres linear, parallel to the edge of 
the frond, but not close to it. 
Tho only. Genus oo ed gee an fed 6 aes, HLS, eee 
Tribe 7. ASPLENIE®. Sori and involucres linear or oblong, running 
down the veins. 
Whe only genus .°. s « - - « + « + 6 «LO, ASBDENIee 
Tribe 8. Asprpinm. Involucre placed over the sorus, globose or oblong. 
Involucre large, elliptical, attached to a linear re- 
ceptacle. . . . . . 20. DIDYMOCHLENA. 
Involucre orbicular, ‘peltately attached . . . . 21. ASPIDIUM. 
Involucre reniform, attached by the sinus. Pinne 
divided and not articulated at the base . . . 22. NEPHRODIUM. 
Involucre reniform. Pinne simple, articulated at 
the base. . . . . . 23, NEPHROLEPIS. 
Involucre reniform. Frond quite simple . ». . 24, OLEANDRA. 
Tribe 9. EUpoLYPopIE®. Sori without an involucre, globose or rarely 
suboblong. 
The only penus'.s Fl oe los. . 2b BORED 
Tribe 10. GRAMMITIDEX. Sori linear or linear-oblong, without an in- 
volucre. 
Frond simple, like leaves of grass. 
Fronds with a midrib only . . . . 26. MonoGRaMME. 
Fronds with copious veins in addition to the 
midrib . . eitijacS» A. Qi ly VRAIS 
Fronds compound, orbicular « or ovate. 
Sori marginal. . . ce ee es ee 2. NOMOG Ey auaaS 
Sori running down the veins. . . . . . . 29. GYMNOGRAMME. 
Tribe 11. AcrosticHE®. Sori spread over under surface of the frond. 
The only genus. ... . . .. +. «+ . . « 30. ACROSTICHUM. 
Suborder 4. Osmundeze. Vernation circinate. Capsules with an in- 
complete horizontal ring, opening at the apex. 
Fructification in special thyrsoid clusters (modified 
portions of the frond) . . 31. OsmuUNDA. 
Fructification on the back of ‘the e leafy part of the 
TORU! sais us Tees oor Os oe) sone BQ LODRA. 
Suborder 5. Schizzeee. Vernation circinate. Capsules opening down 
the side, crowned with a small, complete ring. 
Capsules in special distichous spikes . . . . . 33. ScHIzma. 
Capsules in special dense thyrsoid clusters . . . 34, ANEMIA. 
Capsules on the back of the leafy part of the frond 35. Mounra. 
Suborder 6. Marattieze. Vernation circinate. Capsules concrete in 
boat-shaped masses in the only Cape genus. . . 36. Mararrta, 
Suborder 7. Ophioglossese. Vernation not cireinate. Capsules deeply 
2-valved, without a ring, forming a aaah 2-ranked spike in the only Cape 
genus . 1 20+ (s « APURMIOER . . . 37. OPHIOGLOSSUM. 
