99. FILICES. 
419 
Tr. III. ASPLENIEjE. Clusters oblong or linear, usually 
covered by an indusiuni opening longitudinally on one side, 
placed on the side of tbe lateral veins. 
7. Athyrium. Clusters oblong-reniform. Indusium open- 
ing towards the central vein or niidrib, margin fringed. 
8. AsPLENiUM. Clusters long, straigbt. Indusium opening 
towards tbe central vein or midrib, nearly flat. 
9. ScoLOPENDHiuM. Clusters long, straigbt, 2 togetber. 
Indusia of eacb pair opening towards eacb otber. 
10. Ceterach. Lateralveins anastomosing; clusters attached 
to tbeir middle on tlie side next tbe niidrib, except in tbe 
lowest. Indusium (?) a uaiTow nearly erect membrane on 
tbe back of tbe vein. Whole back of the frond covered 
with .chaffy scales. 
[11. Gymnogbambie. Clusters oblong or linear on both 
branches of tbe forked vein, becoming confluent and cover- 
ing the back of the frond. Indusium wanting.] 
Tr. IV. ADIANTEJE. Capsides covered by a marginal or 
submarginal elongated part of the frond, or by a separated 
portion of the cuticle resembling an indusium. 
12. Blechotm. Capsides in a continuous line parallel to 
the midrib upon a longitudinal anastomosing part of the 
transverse veins, covered by a continuous scarious indu- 
simn. — Barren and fertile fronds dissimilar in our plant. 
1.3. Pteris. Capsides in a continuous marginal line covered 
by a continuous indusiimi formed of tbe 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 oblique, transverse, 
complete. 
Tr. V. HY3IEN0PHYLLEM. 
15. Trichomanes. Capsules on a long filiform receptacle 
within a cupshaped involucre of the same texture with the 
frond. 
16. Hymenophyllum. Capsules on a naiTow subclavate 
receptacle within a two- valved involucre of the same texture 
with the fr'ond. 
