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316 
THE GENERA AND SPECIES OF CULTIVATED FERN'S. 
"a 
other genera, renders it exceedingly difficult to construct clear distinctive generic characters ; forked free veins 
and reniform indusia, the most obvious marks of Lastrea, being common to Nephrolcpis and Oleandra, and are 
likewise found in Polystichum. It is therefore necessary to point out that habit 
is combined with the above-mentioned characters, to furnish technical marks by 
which the Lastreas may be recognised. Fig. 62 represents a pinna of 1. marginalia 
(nat. size). 
1. 1. decurrens, J. Smith (Polypodiutn decursive-pinnatum of gardens). — A 
half hardy or greenhouse deciduous Fern, from China. Fronds lanceolate, pin- 
nate, a foot or more long, palish green ; pinna; sessile, pinnatifid, deeurrent and 
lobed, forming a sinuose wing to the rachis, lower ones small and entire. Sori 
terminal, or sub-terminal. Indusium small, soon becoming obsolete. Stipes and 
rachis paleaceous ; terminal, adherent to a decumbent somewhat tufted rhizome. 
2. 1. Oreopteris, Presl (Aspidium, Swartz). — A fragrant deciduous hardy 
species, indigenous to Britain and found throughout Europe. Fronds lanceolate, 
glabrous above, glandulose beneath, pinnate, one to two feet long, yellowish 
green ; pinnse lanceolate, sessile, deeply pinnatifid, with obtong-obtuse entire flat 
segments, largest next the rachis. Sori sub-marginal. Indusium small, indistinct 
glandulose. Stipes very short, covered with pale brown scales, some of which are 
also scattered on the rachis. Fronds terminal, adherent to a thick, somewhat 
tufted scaly rhizome. 
3. 1. contermina, Presl (Aspidium, WiUdcnow). — An ornamental evergreen 
warm greenhouse species, a native of the West Indies and many parts of Tropical 
America. Fronds lanceolate, one to one and half foot long, yellowish green, pin- 
nate ; pinna? lanceolate, sessile, rather hairy, glandulose beneath, deeply pinnatifid, 
with oblong-obtuse segments, largest next the rachis. Sori sub-marginal. Indu- 
sium hairy. Fronds terminal, adherent to a somewhat creeping rhizome. 
4. 1. Kaulfussii, Presl (Aspidium, Link). — An evergreen stove Fern, from 
Brazil ? Fronds pubescent, lanceolate, one to one and half foot long, dull green, 
pinnate ; pinna; lanceolate, sessile, deeply pinnatifid, with oblong obtuse segments. 
Sori sub-marginal. Indusium very hairy. Stipes with a few scattered scales. 
Fronds terminal, adherent to an erect rhizome. 
5. 1. noveboracensis, Presl (Aspidium, Swartz). — A rather dwarf growing 
hardy deciduous Fern, from North America. Fronds hairy, lanceolate, about a 
foot high, very slender, rather membranous, light green, pinnate ; pinnoe lanceolate, sessile, deeply pinnatifid, 
with linear oblong obtuse segments, largest next the rachis. Sori medial. Fronds terminal, adherent to a slender 
creeping rhizome. 
6. L. patens, Presl (Aspidium, Swartz; A. molle, link). — An ornamental evergreen stove species, from the 
West Indies. Fronds broadly lanceolate, pinnate, pubescent and glandulose beneath, three to five feet long, light 
green ; pinna; sessile, lanceolate, deeply pinnatifid, with linear oblong sub-falcate segments, acute at the apex and 
largest next to the rachis. Sori medial. Indusium glandulose, and very hairy. Stipes with large scales at the 
base. Fronds terminal, adherent to an erect caudex, often a foot or more high. 
7. 1. atigeseens, J. H. (Aspidium, link; Kephrodiuni Ottonis, of gardens). — An evergreen stove Fern, from 
Cuba. Fronds slender, semi-erect, pubescent, broadly lanceolate, three to four feet long, palish green, pinnate ; 
pinna; narrow linear-lanceolate, sessile, pinnatifid, with oblong rather obtuse small rigid segments, largest next 
the rachis. Sori medial. Indusium hairy. Fronds lateral, or terminal, adherent to a creeping rhizome. 
8. 1. invisa, Presl (Aspidium, Swartz). — An evergreen stove species, from Jamaica. Fronds lanceolate, 
minutely pubescent beneath, pinnate, four to six feet long, pale green ; pinna; linear-lanceolate, a foot or more 
long, inferior ones petiolulate, superior sessile, with linear-oblong sub-falcate segments, acute at the apex. Sori 
medial. Indusium minutely pubescent. Stipes scaly at the base ; lateral, adherent to a scaly creeping rhizome. 
9. 1. Thelypteris, Presl (Aspidium, Swartz ; Thelypteris palustris, Schott). — A hardy deciduous Fern, indi- 
genous to Britain, and found throughout Europe, Asia, Africa, and North America. Fronds of two kinds. Fertile 
fronds erect, rather contracted, lanceolate, pinnate, one and a half to two feet long, rather membranous, pale green ; 
pinna; lanceolate, deeply pinnatifid, inferior ones petiolulate, superior sessile, segments oblong with revolute 
edges. Sori medial. Indusium terminating on the free margin, with glandulose hairs. Sterile frond pinnate, 
one to one and a half foot long ; pinna; lanceolate, deeply pinnatifid, with oblong flat segments. Fronds glabrous ; 
lateral, adherent to a slender creeping rhizome. 
10. 1. vestita, J. Smith (Polypodium, Eaddi). — A beautiful evergreen stove Fern, from Brazil. Frond ovate- 
lanceolate, pinnate, one and a half to two feet long, pubescent ; pinna; lanceolate, deeply pinnatifid, inferior ones 
petiolulate, segments linear-oblong, repand, and acute at the apex. Sori medial. Eaehis and stipes covered 
with narrow dark scales. Fronds terminal, adherent to a short somewhat creeping rhizome. 
11. 1. chrysoloba, Presl (Aspidium, link). — A beautiful and rather erect growing evergreen stove Fern, from 
Brazil. Fronds pubescent, triangularly elongate, one to one and a half foot long, pinnate, bipinnate below, dull 
Fig. 62. 
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