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THE GENERA AND SfECIES OF CULTIVATED FERNS. 
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291 
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(TtAGEXIA, Prcsl. — Named from sagene, a large net; in allusion to the coarse reticulations of the fronds, 
liy Sori reniform or orbicular, uniserial on each side the primary veins, or irregular, produced on the angles or 
points of confluence of two or more veinlets, hut more generally on the apex of a free veinlet which terminates 
within the areoles. Indusium reniform or orbicular. Veins pinnate ; venules 
arcuately or angularly (or in the sterile fronds compoundly) anastomosing, form- 
ing unequal areoles with variously directed free veinlets. Fronds pinnate or bipin- 
nate, from two to four feet high ; pinnae lobed or sinuously pinnatifid. — The few 
species arranged here are very similar in habit and general appearance to those of 
Aspidium. The only technical distinction is, that the fertile fronds of Sagenia 
have a more simple venation, the sori being usually reniform and commonly 
produced on the apex of a free veinlet within the areoles, whereas, in Aspidium, 
the sori are usually produced on the angular crossings of a compound anastomos- 
ing venation. Fig. 55 represents a pinna of S. rcpandum (small size). 
1. <S'. demrrens, J. H. (Aspidium decurrens, Presl.; J. Smith). — A very singular- 
looking evergreen stove species, from India and Ceylon. Fronds of two kinds, 
sterile and fertile. Fertile fronds contracted, glabrous, rather erect, sub-pinnate, 
two to three feet high, yellowish-green, segments distant oblong-acuminate, 
crenate, lower pair two-lobed, decurrent at the base and running down near to 
the rhizome, forming a broad undulated wing to the rachis. Sori reniform, im- 
mersed, forming elevated protuberances on the upper surface of the frond. Stipes 
scaly ; terminal adherent to a rather erect tufted rhizome. 
2. S. repandum, "Willdenow (S. platypbylla, /. Smith). — A very handsome ever- 
green stove Fern, from the Philippine Islands. Sterile fronds glabrous, pinnate, 
three feet long, bright shining green ; pinnae large, drooping, oblong-acuminate, 
petiolulate, coriaceous, a foot or more 
long, inferior ones two-lobed, roundish 
at the base and entire at the margin. 
Fertile fronds contracted, semi-erect, 
repand ; under side of the lower pinnos 
with one or two deep segments, and 
crenate at the margin. Sori 
reniform. Stipes scaly at the 
base ; terminal, adherent to 
fo'<T\\f\'l?Praft V ./^l an erec t rhizome. 
vfinT / '"2« / 3. S. Sippocrepis, Prcsl 
(Polypodium, Jacquin ; As- 
pidium, Sivartz). — An orna- 
mental evergreen stove Fern, 
a native of the West Indies, 
Mexico, and New Grenada. 
Fronds glabrous, triangu- 
larly elongate, two to three 
feet high, light green, bipin- 
natifid ; pinnae oblong-acu- 
minate, segments oblong, 
rather obtuse, and crenate at 
the margin. Stipes scaly at 
the base ; terminal, adherent to an erect rhizome. This species has been 
introduced to Kcw, from Jamaica, in the early part of the present year. 
4. S. coadunala, J, Smith (Aspidium coaduuatum, Wallich). — A large 
growing evergreen stovo Fern, from Ceylon. Fronds glabrous, trian- 
gularly elongate, two to three feet long, pale green, bipinnate ; pinna; 
triangularly elongate, acuminate, inferior pinnules distant, superior pin- 
natifid, decurrent at the base, and obtusely or deeply crenate on the mar- 
gin. Stipes thickly scattered over with long narrow scales at the base ; 
terminal, adherent to a thick scaly somewhat creeping rhizome. 
CiXOCLEA, Linnmis. — Name derived from onon, a kind of vessel, and 
) ilea, to shut or close ; alluding to the sori being enclosed by the 
'•'' D ' peculiarly formed lobes of the fertile pinna;. 
Fronds of two kinds. The fertile fronds contracted; segments rugose, sessile, bacciform, oblong or sub-globose, 
with a membranous conniving timbriatc margin, constituting an universal indusium. S>ri round, continent, four 
F,;/. 55. 
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