BRITISH FERN’S. 
indusia, attached by their concave side, the detached 
side fringed with hair-like segments. 
7. 4Dorsal-fruited Ferns, having the indnsia 
straight and elongate, and attached by the side to¬ 
wards the margin of the pinnae or pinnules. 
8. &ofopCTdn'«7a=Dorsal-frnited Ferns, having the sori 
elongate, and proximate in parallel pairs, the indusia 
opening along the centre of the twin son. 
» Ceterach = Dorsal-fruited Ferns, having the indusia, 
obsolete, and the sori hidden among densely imbri¬ 
cated, rust-coloured, chaffy scales. 
. />Vec/inim=Dorsal-fruited Ferns, having 1 
; margin of whose^frond v^sori- 
is, having the spore-cases in a 
. , . — --- — —i edge of the frond, beneath 
indusia, formed of the altered margin 
§ Ai>jANTEM=Fems, the margin of whose fonds bears re- 
flexed lobes, which are changed to indusia, and bear 
epore cases on their under surface. 
12. ^djaniim=Dofsal-£hiited Ferns, having the spore-cases 
in patches, on the reflexed, altered apices of the lobes 
of the fronds, which form indusd* 
1& Lystoptens — Dorsal-fruited Ferns, having cucnllate or 
hooded semi-involueriform indusia, attached by 
their broad base. 
§ Woodsire==F *ms whose sori have special invducriform 
or sam-mvolucriform indusia, roundish, and springing 
from the back of the veins. 
|A V, d-frnited ~ - 
li - iFood«a=I)orsal-iraitect h'erns, having th 
involucriform, i.e., attached beneath the sori 
vided at the margin into hair-like incurved & 
§ Htmestophthe* = Ferns whose 
around the ends of i 
i projecting from, the margin m 
