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is only incidentally mentioned in Synopsis Filicum in the
account of that species. Both plants have rather small deltoid
quadripinnate fronds, pubescent stalks and surfaces, and
rounded ultimate divisions. But C. viscosa is more glandular
and viscid than C. leucopoda, has dark-brown stalks, and a
well-developed white-membranaceous involucre. In the present
plant the stalks are pale straw-color, and pubescent with
delicate white spreading hairs. The rachis and its divisions
are similarly hairy, though the pinnules are somewhat glandular
viscid. The recurved lobules, which form the involucres,
do not lose their herbaceous character. These points of difference
seem sufficient to keep the two ferns apart. C. leuco-
Poda is given simply as Mexican by Link, but it has been
collected near San Luis Potosi, according to Fournier. Of
C. viscosa, fine specimens, also from San Luis Potosi, have
just been distributed by Drs. Parry and Palmer (No. 990).
The reference of that species to New Mexico in Synopsis
Filicum, arose, as I learn from Mr. Baker, from a typographical
error, North Western Mexico having been intended.
The figure in Plate X L IX . was drawn from a specimen kindly lent
for the purpose by Mr. Davenport. The details explain themselves.
P l a t e X L IX . — F ig . 1 2 - 1 4 .
CH E I l.A N T I - IE S A R G E N T E A , K u n z e .
Silvery Lip-Fern.
C h e i l a n t h e s a r g e n t e a ; — Root-stock short, clothed with
rigid pointed blackish scales; stalks clustered, two to six
inches long, wiry, dark-brown, glossy, sparingly chaffy towards
the base; fronds one to four inches long, deltoid-ovate, pedately
tripartite; divisions deeply pinnatifid, the middle one
short-stalked, triangular, the side ones sessile, unequally triangular,
broadest on the lower side; lobes oblong, often sub-
falcate, entire or crenately lobed, obtuse, smooth and green
above, beneath covered with white or yellow ceraceous powder;
veins forked from a midvein, free; sporangia at the
ends of the veins, covered when young by a manifest scarious
crenulate involucre formed from the margin of the
frond.
Cheilanthes argentea, K u n z e , in Linnsa, xxiii., p. 242. — H o o k e r , Sp.
Fil., ii., p. 7 6 ; Fil. Exot., t. xcv.— M e t t e n iu s , Fil. Hort. Lips.,
p. 5 0 ; Cheilanthes, p. 45. — M i ld e , Fil. Eur. et A t l, p. 3 7 .—
H o o k e r & B a k e r , Syn. F il, p. 142.
Pteris argentea, G m e lin . — S w a r t z , Syn. F il, p. 10 5 , 3 0 1 . — W i l ld e n o w ,
Sp. P I , V., p . 3 6 0 . — L a n g s d o r f f & F i s c h e r , Ic . F il, p. 19 , t.
22. — R u p r e c h t , Distr. Crypt. Vase, in Imp. Ross., p. 46. (For
other synonymy consult the authors above referred to.)
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