POLYPODIACE®. 1239 
tIndusium : eh] <5 ee ete 
—[p. 1238] 
Sporangia on the under side of the indusium, which consists 
d — 
wee eee teste ee eeeee 
Veins supporting sori on their ieiving psi is more or 
less transversely from midrib to ma — 
Sori terminal or ree so on previa veins, globose and, 
at least at first, discrete...........csecsecserseeees Chei es. 
Sori on a slender, sen receptacle in the axis of the 
indusium, ear a several to many veins, linear and 
continuow 
‘nue of fronds very small and narrow, the recep- 
tacle —— ng the apices of few veins ...Onychium. 
Segments of fronds conspicuous, the receptacle con- 
ene i apices of MANY VEINS. .<.cos.scsesreeres Pteris. 
Veins supporting sori ¥3, longitudinal, gen parallel 
both to midrib and margin :....)..i5:;.60 00400 topteris. 
tSori remote from margin of ria :—[p. 1238] 
gic us eet linear or oblon 
jacsaniooats once or oftener pinnate :— 
dusium membranous, parallel and close to ae BGs og 
towards m num 
Indusium gacnn from midrib, single ae opening 
d b, and opening both towards 
towards midrib, or double 
midrib and margin of leaf ......... cases eaeet rp 
Fronds tb st flabellate...............00+++0++..-Actinopteris. 
sings reni get rm 
‘ 43 , ae PY taphita.daticad ahnva 
QOLLEG aAvVUVe 
Nephrodium. 
Pinne always simple, articulate at base, with white, cretaceous 
bi Nep i 
above ep. Tro: epis. 
ots 
*Sori without an indusium :—[p. 
38] 
pein on the back of th e lobes ee to the veins es Ree 
PTreverrre rr eee ree eee rs 
“Veins not all soriferous :—[p. 1240} 
Sori generally distributed on the soriferous veins :— 
main-veins Only \...0...s.000c+++5 G me. 
Sori on the transverse ‘cannes iaialoli only 
ium. 
Sori circumscribed to a marginal or submarginal line parallel 
to midrib and margin of frond :— 
