XVI. TiENIOPSIS. 
.■SO 
pound anastomosing venation, -with the naked linear continuous sori running parallel -with and near to 
the margin. Fig. 16 represents the upper portion of a frond of Drymoghssum lanceolatum (nat. size). 
1. D. piLOSELLOiDES, Presl (Pteris, Linneeus ; Pteropsis, Pesvaux ; NoTHOCHLiENA, Kaulfuss). — A dwarf 
creeping evergreen stove Fern, native of the East Indies and Malay 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 filiform 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 in the garden of the Duke of Northumberland, at Syon. 
2. D. LANCEOLATUM, J. Smith (J't'ekis, Linnetus ; Pteropsis, T!2mn:is, Kaulfuss). — An ornamental 
evergreen stove Fern, from Jamaica. Fronds uniform, lanceolate, 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 
slender slowly creeping rhizome. Venation internal. 
XVI. T^NIOPSIS, J. Smith. 
Son linear, continuous, immersed in an intramarginal groove. Veins simple, parallel, their apices 
combined, and forming a transverse sporangiferous receptacle. Fronds simple, linear-lanceolate, one 
to tvro feet long, plane or Avith the margin revolute. — Name derived from tainia, a fillet or band, 
and opsis, resemblance, from the long narrow outline of the fronds. 
In habit, venation, and external appearance, the species of this genus 
are precisely identical with Vittaria ; the only ground on which they 
are separated is the position of the sporangiferous receptacle, which in 
Vittaria is marginal, and in Tmiiojisis is intramarginal. Fig. 17 repre- 
sents a frond of Tmiiopsis graniinifolia (med. 
size). 
1. T. LiNEATA, J. Smith (Vittaria, Swartz).— A 
singularly narrow evergreen stove Fern, from the "West 
Indies. Fronds simple, glabrous, pendulous, one to two 
feet long, and about an eighth of an inch broad. Veins in- 
ternal, and very few; costa obsolete. Fronds lateral, forming 
a dense mass on a short creeping scaly rhizome. Sori intra- 
marginal, in a groove nearly the whole length of the frond. 
2. T. graminifolia, J. Smith (Vittaria, Kaulfuss ). — 
An ornamental evergreen species, from the "West Indies. 
Fronds simple, glabrous, rather erect, about ten inches 
high, lanceolate-acuminate, undulated and attenuated at 
the base. Sori submarginal, continuous or interrupted, 
and confined to the upper half of the frond. Venation 
internal. 
XVII. VITTARIA, Smith. 
Sori linear, continuous, immersed in a marginal 
groove. Veitis simple, parallel, combined at their 
apices by a transverse marginal vein, on which is 
produced the sporangiferous receptacle. Fronds 
simple, linear-elongate, from one to four or five feet 
long. Bhizome creeping. — Name derived from vitta, 
a ribband ; which the long narrow fronds resemble. 
This genus consists of a fcAv narrow -fronded 
grassy-looking tropical Ferns, and originally comprised ten or twelve species. 
In aspect, habit, and wenation, they coincide with Tdtniopsis, from which, on 
account of the variation in the position of their sori, they have been divided. 
The species of Vittaria have their sori in the edge of the frond, opening out- 
ward ; whilst those of Temiopsis have their sori medial or intramarginal, in 
♦ Fig. 17 . plane under surface of the frond. In both cases the sori are immersed 
in grooves. Fig. 18 represents a small frond of Vittaria zostcrafolia. 
