III. STllUTHIOI'TERIS. 
23 
12. P. ALPESTRE, (ASPIDIUM, SchlcuJlT ; A, HHCETICUM , Y . Dc Caudoll^ m Au 
ornamental, hardy, deciduous Fern ; native of Switzerland, and of the Highlands of Scotland. Fronds glabrous, 
lanceolate, one to three feet long, bipinuate, with lanceolate-acuminate pinnae ; the pinnules distinct, pinnatifid, 
oblong. Sori medial, round and uniserial. Stipes short, terminal, adherent to a short decumbent rhizome. 
13. P. DREPANUM, Loive (AspiDiUM, Swavtz ; PoLVSTiCHUM,'’Pr«sl).— An ornamental evergreen warm green- 
house species, from Madeira. Fronds ovate acuminate, one and a half to two feet long, hipinnate, dark green ; 
pinnae four to six inches long ; pinnules lanceolate, falcate, aurioulate, pinnatifid, inferior ones distant, cuneate at 
the base, superior basal ones longest, uppermost ones confluent, the segments all acutely toothed. Rachis and 
stipes paleaceous ; terminal, adherent to a fasciculate erect rhizome. This plant has been placed in jLspidiea by 
most authors ; and we had adopted this view in the Gardener’s Magazine of Botany (iii. 320) ; hut having since 
had an opportunity of examining the sori in its earliest stages, we have now no hesitation in referring it back to 
Folypodium, it being entirely destitute of an indusium. 
14. P. EFFusuM, Swartz. — An evergreen stove Fern, from Jamaica. Fronds deltoid, membranous, three to 
five feet long, glabrous, pale green ; four times pinnate, with lanceolate pinnae ; the pinnules linear-lanceolate, 
with pinnatifid segments, the lower one distant. Sori round, medial ; veins pinnately forked. Stipes scaly, 
especially near the base, adherent to a short creeping rhizome. 
15. P. AMFLUM, Sumholdt (P. lachnopodium, J. Smith — fide Klotzsch). — Avery ornamental stove species, from 
Jamaica. Fronds deltoid, of a soft delicate texture, from two to four feet long, hi-tripinnatifid, with lanceolate- 
acuminate pinnules, and oblong-linear, obtuse, hairy segments. Sori round, medial. Stipes and rachis densely 
covered with narrow brown scales. The fronds are terminal, adherent around an erect (caudiciform) rhizome. 
16. P. RUGULOSUM, Lahillardiere (Hypolepis rugulosa, J. Smith ; H. amaurorachis, FLooher ; Cheilanthes 
AMA iJRORACHis, Kunzc). — A ramhling-growing evergreen greenhouse species, native of New Holland, New Zealand, 
and the Island of Tristan d’Acunha. Fronds triangular elongate, ‘from two to four feet high, tripinnate, pinnoe 
lanceolate, with lanceolate-acuminate pinnules, and oblong, rather obtuse segments, the lower ones distant and 
pinnatifid, margin slightly crenulated. Sori round, suh-marginal. Fi'onds covered with glandulous hairs, lateral, 
adherent to a very peculiar, elongated, rough, creeping rhizome. Eachis and stipes purplish. 
III. STRUTHIOPTEEIS, Willdenow. 
Sori round, confluent, wholly occupying the under surface of the segments ; spor 
base of the pedicels concrete, forming an elevated, thickened receptacle. Veins 
Fronds of two kinds — fertile, with contracted, revolute mar- 
gins, forming a spm-ious universal indusium ; the pinnee linear, 
revolute, moniliform, each segment producing five soriferous 
veins, the margin becoming replicate and lacerated, and wholly 
occupied by round confluent sori . — Name derived from strutliios, 
an ostrich, and pteris, a fern ; in allusion to the resemblance of 
the fronds to ostrich-feathers. 
The habit of this genus, more than any technical character, 
separates it from Polypodkmi. Fig. 3 represents a pinnule of the 
sterile, and a portion of the fertile frond of Struthiopteris penn- 
sylvanica (nat. size.) 
1. S. GERMANicA, WUldeiiow (OsMUNDA SiRUTHioPTERis, Litmceus) 
A hardy deciduous ornamental Fein, from the south of Europe. Sterile 
fronds arranged in an exterior circle, reclining, from two to three feet 
long, lanceolate, pinnate, with pinnatifid - acuminate pinme. Fertile 
fronds few, occupying the centre, erect, about a foot long, dark brown, 
and resembling a bunch of feathers ; they are contracted, pinnate, the 
pinnse crowded, linear, revolute, and moniliform. Sori round, confluent. 
Fronds terminal, adherent to an erect (caudiciform) rhizome. 
2. S. PENNSYLVANicA, Willdenow (Onoclea nodulosa, SchJcuhr ). — A 
hardy deciduous ornamental species, from North America. The sterile 
fronds commonly attain the height of two feet, and are lanceolate, pinnate, 
the pinnoe acuminate, pinnatifid, with rounded blunt segments. The 
fertile ones are about a foot long, contracted, pinnate, with linear, c 
and moniliform. Sori round, confluent. Ehizome erect ; fronds adherent 
e-cases lateral ; 
pinnate, free. 
pinnoe, which are revolute 
