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THE GENERA AND SPECIES OF CULTIVATED FERNS. 
337 
4. T. crispum, Linnsmis. — A beautiful evergreen stove species, from Jamaica, Brazil, and other parts of South 
America. Fronds hairy, sub-pinnate, from six to ten inches long, light green ; segments linear oblong, round at 
the apex, decurrent at the base, forming a winged rachis. Sori on the apex of the segments. Fronds terminal, 
adherent to a short creeping rhizome. This Fern was introduced to Kew in the early part of 18.51 from Jamaica. 
5. T. venosum, R. Brown. — A small delicate evergreen warm greenhouse Fern, from New Holland and New 
Zealand. Fronds glabrous, slender, pinnate, three or four inches long, light green ; pinnse linear, inferior ones 
petiolate, lobed, or pinnatifid at the base ; lateral, adherent to a hair-like creeping rhizome. This species has 
been in cultivation since 1845. 
6. T. radicans, Swartz (T. speciosum, WiUdenow ; T. brevisetum, S. Brown). — An elegant evergreen, warm 
greenhouse fern, indigenous to Britain, and also found in Madeira, the Canary Islands, Brazil, the West India 
Islands, East Indies, Islands of the Pacific, &c. Fronds glabrous, triangularly elongate, from six inches to a foot 
long, tri-quadri-pinnatifid, light green ; segments linear, entire, or obtusely bifid, rachis winged and decurrent on 
the stipes, which is densely covered with dark hair-like scales. Indusium cylindrical, scarcely two-lipped. Sori 
solitary in the axils of the upper segments. 
7. T. seandens, Linnams. — A beautiful evergreen stove species from Jamaica. Fronds slightly hairy, branching, 
ovate lanceolate, one to one and a half foot long, tripinnate ; branches spreading ; pinnules oblong-elongate, segments 
oblong-obtuse, pinnatifid, and decurrent at the base. Stipes terete ; lateral, adherent to a scandent rhizome. 
MYMENOPHYLLUM, Smith. — Name derived from hymen, a membrane, and phi/Uon, a leaf; an admirably 
characteristic appellation, referring to the membranous nature of the fronds. 
Sori globose, or vertically oblong. Spore-cases sessile, seated round a columnar receptacle, which is included 
in an urceolate, bilabiate, marginal Indusium. Veins direct, free. Fronds simple, pinnate, bi-tri-pinnate or de- 
compound, from one inch to a foot or more high, glabrous, or pilose. Rhizome crcspitose. — The species of 
Hymenophyllum have precisely the same habit and delicate membranous texture of frond, as those of Trichomanes. 
There are upwards of eighty described species, among which are two indigenous to Britain. — The technical cha- 
racter by which they arc distinguished from Trichomanes is, the short sporangiferous receptacle which is included 
within an urceolate bilabiate indusium, in- 
stead of being exserted beyond the margin. 
Fig. 74 represents a pinna of H. dilatation, 
a species from New Zealand (nat. size), with 
a magnified indusium, turned back, show- 
ing the position of the sori. 
1. H. timbridgensc, Smith. — A neat, low- 
growing evergreen, hardy or frame species, 
indigenous to Britain, and found in the Al- 
pine districts of Europe, in Madeira, the 
Azores, Cape of Good Hope, South America, 
Tasmania, and New Zealand. Fronds small, 
pinnate, one to four inches long, olive green ; 
pinna? distichous, vertical, with linear seg- 
ments, undivided or bifid, and spinulosc-ser- 
rate. Involucres supra-axillary, solitary, 
sub-compressed, and spinulosc-serrate. Ra- 
chis winged. Fronds lateral, adherent to a 
filiform creeping rhizome. 
2. II. Kntto£wa&, "WiUdenow (H.Wilsoni, 
Hooker). — A neat evergreen, hardy or frame 
species, indigenous to Britain, and found in 
other parts of Europe, in Africa, South Ame- 
rica and New Holland. Fronds lanceolate, pinnate, one to four inches long, olive 
green ; pinnm recurved, digitatcly -pinnatifid, sub-sccund ; segments linear and 
spinulosc-serrate. Involucres supra-axillary, solitary, oblong, convex or inflated, 
entire. Rachis winged. Fronds lateral ; adherent to a filiform, creeping rhizome. 
3. II. hirsutum, Swartz.— A dwarf growing evergreen, stove species, from Ja- 
maica. Fronds slender, reclining, two to three inches long, very palo green, 
bipinnatifid ; segments linear-oblong, round at the apex, inferior ones largest, 
deourrent on tho stipes. Fronds thickly covered throughout with forked or stellate 
hairs ; lateral, adherent to a filiform creeping rhizome. 
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•p. >g - j- .. Sect. IV.— Dicksonicrc, ./. Smith . 
ITOLOBIUM, flcsraux. — Name probably derived from ritet, coin, and lohn 
tion of the fructification on tho lohes of the pinnules. 
lobi ; i" ^illusion to tho situs 
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