TAB. LIX. 



Hypolepis pteridioides, Hook. 



Stipite stramineo, fronde (ut videtur) ampla, basi trichotome 

 et pedatim divisa 3-4-pinnata submembranacea glabra sic- 

 citate olivacea, pinnis primariis subsesquipedalibus oblique 

 ovatis acuminatis petlolatia rellquis 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 (Eupteris) of the group to which 

 Pt. arguta, Ait. and Pt. flabellata, 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; — not. size. f. 2, 3. Sori seen from be- 

 neath, and /. 4. Impressions caused by the sori, as seen on 

 the superior side of the segment ; more or less magnified. 



Cent, 2, t, 59, 



