I . V :
Polypodium juglandifolnim, H um b o ld t, Bo n p i.an d & K u n th , in Willdenow,
Sp. PL V ., p. 195 ; Nov. Gen., i., p. 10, vii, t. 665.
Amblia juglandifolia, P resl-, Tent. Pterid., p . 18 5 , t. vii., f ig . 2 2 .— P'ée,
Gen. F il., p. 2 8 4 , t. xxii., B, f ig . I .
Phanerophlebia jicglandifolia, J. S mith, in Hooker’s Journ. Bot., iv.,
p. 187.
Cyrtomium juglandifolium and C. nobile, Moore, Index, p. 277.
Aspidium nobile, S chtechtendal, in Linnsea, v., p. 6 10 .— K unze, in
Linnaa, xiii., p. 146, xviii, p. 34 4; Die Farrnkr., i., p. 155, t.
Ixvii. — Mettenius, Fil. Hort. Lips., p. 8 7 ; Aspidium, p. 37.
Phaiierophlebia uobilis, P r e s l , T e n t P te r id ., p. 8 5 , t. ii., fig . i g .
H ooker, Gen. Fil., t. xlix, A .— F é e , Gen, Fil., p. 2 8 2 , t.
xxii. B, fig. 2. — L iebm.ann, Mex. Bregn., p. 1 2 4 . — E aton, in
Bot. Mex. Boundary, p. 2 3 5 .
Cyrtojnium nobile, Moore, Index, p. 277.
Aspidmm piimihtm. Martens & G aleotti, Syn. Fil. Mex., p. 64, t. 17,
’-bia pumila, F é e , Gen Fil.. p. 282.
Phatierophlebia nobilis, P. pumila, P. Lindeni, P . jug landifo lia and
P . remotispora, F ournier, PI. Mex., Crypt., p. 100.
H ab.—Western Texas, at Van Horn’s Wells and the Huecco
Tanks, collected by the botanists of the Mexican Boundary Survey.
Mexico to Venezuela.
D e s c r i p t i o n ; — The few fronds brought home from the
survey of the Mexican Boundary about twenty-five years ago
are the only specimens known to have been collected anywhere
within the limits covered by this work. The region
which includes the two stations above named lies between the
Rio Pecos and the Rio Grande, and here a number of Mexican
and tropical American types find their northern limit.
In Venezuela this fern attains a height of three feet, but
in Mexico it is commonly of lower stature, and the Texas
specimens are not above a foot long, stalk included.
The root-stock is erect and somewhat woody. It is covered
with large ovate dark-brown ciliated scales, which in the
larger plants have a still darker and denser central spot. The
stalks are from a few inches to a foot long, or even longer.
When young they are very chaffy with narrower scales than
those of the root-stock, but this covering gradually wears off.
The stalks are channelled in front, and contain two lateral
strap-like fibro-vascular bundles, besides several smaller threads
at the back.
The fronds are coriaceous in texture, and everywhere
bordered by. a narrow cartilaginous edge, which is extended
into acute and incurved teeth especially towards the ends of
the pinnæ. The upper surface is smooth and shining, and
the lower surface bears a few little scattered chaffy scales.
The Texas fronds have six or seven pinnæ on each side, besides
a separate terminal pinna a little larger than any of the
others.
Specimens from farther south sometimes have as many as
twelve pinnæ on each side, and sometimes only one ; indeed
a frond is not rarely seen perfectly simple. The plant selected
for our illustration is from Chiapas in southern Mexico, and
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