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134 
THE GENERA AND SPECIES OF CULTIVATED FERNS. 
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(HTETOGONIUM, /. Smith (Acrostichi sp. of Authors). — Named from fajrtos, curved, and gonu, the knee ; in 
(y allusion to the peculiar knee-bent curve of the venules. 
Sori amorphous, universal on the under side of the contracted fertile fronds, or sometimes crowded on the 
venules. Veins pinnate ; venules arcuately or angularly anastomosing, 
producing from their exterior sides or angles of meeting, one or more 
excurrent free or irregularly anastomosing veinlets. Fronds pinnate, 
from one to two feet long. Ehizome creeping. — The aspect of the 
species placed in this group of Acrostichea; varies hut little from that 
of the subsequent genus; the principal distinguishing character is 
their more simple anastomosing venation. Fig. 30 represents a pinna 
of the sterile and fertile fronds of G. flagelliferum (nat. size). 
1. C. JtageUifenm, J. Smith : Wallich. — A proliferous, free-grow- 
ing, evergreen stove fern, from the East Indies. Fertile frond con- 
tracted, erect, pinnate, from one to one and a half foot high ; pinnae 
oblong-acuminate, petiolate, the terminal one narrow and elongate. 
Sterile frond glabrous, rather membranous, pinnate, from one and a 
half to two and a half feeet long ; pinna; petiolate, ovate or oblong- 
acuminate, undulated, the terminal one a foot or more long, narrowing 
upwards, and proliferous near the apex. Both forms are lateral, 
adherent to a creeping rhizome. 
2. C. repandum, J. H. : Blume. — A glabrous evergreen stove fern, 
from the East Indies. Sterile frond slender, reclining, pinnate, one 
and a half to two feet long, membranous, bright green ; pinnae proli- 
ferous, repand, ovate-acuminate, petiolate, deeply crenate or slightly 
lobed, undulated, the terminal one sinuose, elongate. Fertile frond 
erect, pinnate ; pinna; oblong-acuminate, and petiolate; stipes with a 
few scattered scales. Both forms are lateral, adherent to a creeping 
rhizome. This species has been recently introduced by Messrs. Eol- 
lisson of Tooting, - . 
from Java. If , jjgiW 
3. C. crispatiilum, it! i 
J. H. : Wallich.— 
A very handsome 
evergreen stove 
fern, from Ceylon. 
Fronds rather erect 
lanceolate-acuminate, one to two feet long, pinnate, deep 
green, with linear-acuminate petiolate, glabrous, undu- 
lated pinna;, having the margin crenate, with a row of 
spinulose teeth, one to each marginal sinus. Fertile 
frond erect, pinnate, one foot high ; pinna; narrow, and 
petiolate. Both forms are lateral, the stipes scaly, adhe- 
rent to a creeping scaly rhizome. 
(W YMNOPTEEIS, Bcrnliardi (Acrostichi sp. of Au- 
lj£? thors).- — Named from gymnos, naked, and pteris, a 
fern ; alluding to the exposed fertile fronds. 
Sori amorphous, densely covering some portion, or 
the whole of the fertile pinna;. Veins pinnate; venules 
compoundly anastomosing, producing variously directed 
straight or curved free veinlets, terminating in the 
areoles. Fronds simple or pinnate, from one to three 
feet long. Ehizome creeping. — The species arranged 
under this genus agree in habit with Cyi'togonium, but 
are distinguished by the more irregular and compound 
anastomosing of the venules. The genus contains ten 
or twelve species, but only two are at present in culti- 
vation. Fig. 31 represents a portion of the sterile 
frond, and a pinna of the fertile frond, of G. nicotiancc- 
folia (med. size). 
1. 6r. nicotianctfolia, Presl : Swartz. — An ornamental evergreen stove fern, from the "West Indies. Fertile frond <| 
erect, pinnate, or hipinnate below, one to two feet high ; pinnae oblong-ovate, lower ones petiolate, upper ones M 
'<7 3 S ^ t ^ fH' 
Fig. 31. 
