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THE GENEKA AND SPECIES OF CULTIVATED FERNS. 
diktyon, 
internal. 
■A 
BICTYMIA, J. Smith. (Polypodii sp., S. Brown; Dictyopteris sp., PresT). — Name derived from 
a net ; alluding to the netted venation. 
Sori oblong, compital, transversely uniserial, receptacle immersed. Venation uniform, articulated, 
Fronds simple, glabrous, coriaceous. Rhizome creeping. — This genus is established 
on habit more than any technical character easily pointed out. The two species 
which it comprises are natives of New Holland and New Zealand. Their uniform 
reticulated venation distinguishes them from Drynaria, the areoles being all sterile. 
Fig. 14 represents the upper part of a frond of I), attenuata (nat. size). 
1 . I). attenuata, J. Smith : E. Brown. — An ornamental, evergreen, greenhouse 
Fern, from New Holland. Fronds simple, linear-acuminate, dark green, about a foot 
long, coriaceous, attenuated at the base. Sori oblong, uniserial, on the upper half \\g Y/%\ 
of the frond. Fronds lateral, articulated on a creeping rhizome. 
BRYMOGLOSSTTM, Presl (Pteridis sp. of Authors). — Name derived from drymos, 
a forest, and glossa, a tongue ; alluding to the form of the fronds, and the 
native habitat of the plants. 
Sori linear, continuous, marginal or intramarginal, produced on the transverse 
sides and junctions of the venules, forming a broad marginal or intramarginal 
soriferous band, which is pilose or squamiferous. Venation uniform, compoundly 
anastomosing, producing variously directed free veirdets. Fronds simple elliptical 
or lanceolate, coriaceous, from one to sixteen inches long. Rhizorue creeping. — 
Comparing this genus, in its venation, with that of Diynaria and Selliguea, it is only 
by the position of the linear continuous sori, that it is 
distinguishable. The distinguishing characters are a 
compound anastomosing venation, with the naked linear 
continuous sori running parallel with and near to the 
margin. Fig. 17 represents the upper portion of a frond Up 1 *- .ill' 1 / 'P 
of D. lanceolatum (nat. size). iImpiI' '\ 
1. I), piloselloides, Presl. — A dwarf evergreen creep- IKSH </ 7Sl 
ing stove fern, native of the East Indies and Malayan 
Islands. Fronds of two kinds : sterile — elliptical or 
roundish-ovate, one inch high, attenuated at the base : 
fertile — linear, narrow, two inches high, attenuated at 
the base ; both are lateral, articulated on a slender 
creeping rhizome. Sori confluent, covering the whole 
surface of the frond. This fern is at present extremely 
rare in cultivation, although in 1843 it was covering the 
end of a pine stove of the Duke of Northumberland's, 
at Syon. 
2. J), lanceolatum, J. Smith (Tsenitis lanceolata, 
Kaidfuss). — An ornamental evergreen stove fern, from 
Jamaica. Fronds uniform, from ten to sixteen inches 
long, contracted at the apex where they are soriferous, 
pale green and attenuated at the base ; they are lateral, 
articulated on a creeping rhizome. Venation internal. 
T2ENI0PSIS, /. Smith (VittariEe sp. of Authors).— 
Name derived from tainia, a fillet or band, and 
opsis, resemblance ; from the long narrow outline of the 
fronds. 
Sori linear, continuous, intramargina], immersed in Fig. 17. 
a groove. Veins simple, parallel, their- apices combined, and forming a transverse 
sporangiferous receptacle. Fronds simple, linear-lanceolate, one to two feet long, 
plane or with the margin revolute. — The habit, venation, and external appearance 
of the species of this genus are precisely identical with those of the Vittarias ; the 
only ground on which they are separated, is the position of the sporangiferous 
receptacle, which in Vittaria is marginal, and in Tieniopsis is intramar"inal. Fi°\ 18 
represents a frond of T. graminifolia (med. size). 
Swartz. — A singularly narrow evergreen stove fern, from the AYcst Indies. Fronds 
simple, glabrous, pendulous, one to two feet long, and about an eighth of an inch broad. Veins internal and very 
few, costa obsolete. Fronds lateral, forming a dense mass on a short creeping scaly rhizome. Sori intramarginal 
in a groove nearly the whole length of the frond. 
2. T. graminifolia, J. Smith : Kaulfuss. — An ornamental evergreen species, from the West Indies. Fronds 
Fig. 18. 
T. lineata, 3. Smith: 
rii-1— 
