TAB. LIX. 
Hypolepis pteridioides, Hook, 
Stipite stramineo, fronde (ut videtur) ampla, basi tricbotome 
et pedatim divisa 3-4-pinnata submembranacea glabra sic- 
citate olivacea, pinnis primariis siibsesquipedalibus oblique 
ovatis acuminatis petiolatis reliquis sessilibus lanceolatis 
acuminatis profunde fere ad costam pinnatifidis apicibus 
acuminatis serrato-lobatis, laciniis vix semipollicaribus oblon- 
gis obtuse crenato-serratis margine utrinque monosoris, venis 
remotis liberis infra medium furcatis ramis patentibus, soris 
(in depressione seu cavitate frondis) impressis, involucris 
transversim oblongis fuscis, racbibus stramineis nitidis, costis 
versum apicem pinnarum supra spinulosis. 
Hab. Peak of Fernando Po, at 7000 feet elevation, Gustav 
Mann, n. 348. 
The habit of this Fern, whose fronds are probably too 
large to be preserved entire, seems to be quite that of some 
exotic species of Pteris (Eiipteris) of the group to which 
Pt, arguta^ Ait. and Pt, Jlahellata^ Thunb. belong, and in 
some of them the sori are in a degree abbreviated, but here 
they are as much so as (or more than) in many species of 
Adiantum^ and which have induced me to refer this species 
to Hypolepis, In the present plant I never find more than 
one sorus on each side of a segment, and these sori are invari- 
ably sunk in a cavity or depression, which occasions a cor- 
respondent swelling, of the same form, on the superior side 
of the frond. 
Tab. LIX. Fig, 1, 2. Portions of a fertile frond of Hypo- 
lepis pteridioides ; — nat, size, f, 3. Sori seen from be- 
neath, and f, 4. Impressions caused by the sori, as seen on 
the superior side of the segment ; more or less magnified. 
Cent. 2. t. 5S. 
