CXLVII FILICES. 687 
E VI. Polypodieze.— Habit various. Spo re-cases small, with a longitudinal 
FS rey oblique ring, numerous and. stipitate in sort or patches on the under-side or 
b y the margins of the fr 
A. Sori covered at least when young with an indusium, 
Sori globular or slightly oblong, Indusium cup- 
ed. 
shaped or r globular and 2-valv 
Sori close to the ma rgin, Indusium adnate on the 
upper side, opening in 2 valves or leaving a 
complete ring . . 17. DICKSONIA. 
Sori and indusium protruding from E margin. . 18. DEPARIA 
Sori Veces to or near the marg Indusium adnate 
the base only or slong ‘tha sides forming with 
e frond a complete cup 19. DAVALLIA. 
Sori lina marginal Indusium linear, opening from 
argin kwod s. 
Frond simple, lin Indusium of the texture of 
the frond, the nu apperenny ae oe 
ouble m 0. VITTARIA. 
Frond a or bipinnate. ' Indusium — ipd 
branous . . . 21, LiNDsza. 
Sori marginal, Indusium continuous with the mar- 
gin and o opening from the under edge outwards. 
F sy pinnate „or compound. V Veins of the pinnules 
i din the petiole 22, ADIANTUM. 
rved. Sori 
ronds shat? Pinn Me pennin 
“3 = Indusium a small scale recurved over 
23. HYPOLEPIS, 
Tindak compound, with small lobed segments. Sori 
short or globular. Indusium the slightly altered 
margins of the sige curved over 24, CHEILANTHES, 
Fronds PM. de and indus Hone + usually 
long and . 25. PTERIS. 
Sori in $ tanus — is e ong the midrib. 
Sori on both aed „of the - midrib, | the indusium 
ipie 
Sori at length covering ths eset surface of Bes 
: fertile fr Lomarta. 
Sori at de FUE over the midrib but yet 
tan the margin . 27. BLECHNUM. 
Sori in a single line along the midrib, ina groove 
of which the cogos form the indusium, 
: Frond small, single . . 28. MoNoGRAMME. 
Sori and indusia oblong or shortly lin parallel 
Moe mi midrib, on veinlets connecting ag ea forked 
. 29. Doopra, 
Bori ind ‘indus oblong or inca; on veins diverging 
from the midri 30. ASPLENIUM. 
Sori cian usu small, as in `. Polypodium, but 
with an indusi 
dusium dien. £t the base bearing the so . 81. CxsroPrERiS. 
Indusium m within = brka peltate o or or- 
bicular-re . 92. ASPIDIUM. 
B. No indusium. 
Sori grbicular, usually Lus igni Mond on 
under surtute . . 33. PoLPODIUM. 
