CLASSIFICATION 
61 
Genus 8. Didymochlaena. Sori reniform on the intra- 
marginal raised end of a vein, and covered by a 
reniform or elliptical indusium, attached along its 
length to the vein, and free all round the edges 
and upper end. 
Genus 9. Aspidium. Sori round, indusium round, fixed by 
its centre, peltate. Veins anastomosing copiously. 
Genus 10. Polystichum. Fertile and barren fronds alike. 
Sori round ; indusium round, fixed by its centre, 
peltate ; veins free. 
Genus n. Cyrtomium. Veins anastomosing somewhat; 
other characters as in Polystichum. 
Genus 12. Leptochilus. Fertile and barren fronds different ; 
veins anastomosing ; sori abundant, produced in a 
dense mass, without indusium. 
*** Oleandreae. Fronds articulated to the long woody 
rhizome, simple ; sori in an irregular line near the 
midrib, roundish, covered by a reniform indusium. 
Genus 13. Oleandra. Characters as above. 
Davallieae. Sori terminal to certain veins, marginal or 
submarginal ; indusium opening outward. 
Genus 14. Nephrolepis. Pinnae simple, articulated to 
the rachis ; involucre reniform or suborbicular, 
submarginal, terminal on the inner branch of a 
forked vein. 
Genus 15. Davallia. Frond firm, decompound, jointed to 
the rhizome. Sorus marginal, almost cup-like, in- 
volucre coriaceous. 
Genus 16. Microlepia. Stipe continuous with the rhizome ; 
involucre membranaceous, intramarginal ; sorus at 
the base of a sinus. 
Genus 17. Schizolotna. Sori united in a continuous linear 
marginal line, covered by a linear indusium, opening 
outward. Veins anastomosing. 
***** Asplenieae. Sori not marginal, but (except in Ceterach 
and Ste?iochlaena ) covered by a linear Or oblong 
indusium, opening toward the midrib. 
Genus 18. Athyrium. Sori short, more or less curved, 
often horse-shoe shaped. Indusium present. 
