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very full and careful examination by Mettenius, were finally
rejected by him and by the majority of scientific pteridologists.
In the present species the sori are found on the upper segments,
.or sometimes towards the ends of most of the segments.
They are very large, far larger than in any other of our native
species, being often a fifth of an inch in diameter. The sporangia
have very long pedicels. The spores are almost transparent,
ovoid with one obtuse ridge, — which is marked by a
longitudinal band, or vitta, — and have a minutely roughened or
verrucose surface.
Scouler’s polypody has a much heavier and more coriaceous
frond than any other polypody of our Pacific States, and need
never be confounded with any of them. Dr. Scouler’s specimens,
collected near the Columbia River about forty years ago,
are very much smaller than those received from more recent
collectors.
Plate XX VI., Fig. i. — Polypodium Scouleri. From an Oregon specimen
of medium size. The enlarged fragment shows the peculiar arrangement
of the veinlets.
P l a t e XX VI. — F ig . 2.
POLYPODIUM IN CANUM, S w a r t z .
Gray Polypody.
P o l y p o d iu m in c a n u m ; — Root-stock creeping, rather slender,
scaly; stalks slender, one to four inches long, scaly; fronds
one to six inches long, six to eighteen lines broad, evergreen,
sub-coriaceous, nearly smooth above, beneath thickly dotted with
roundish or ovate peltate scales, pinnatifid to the midrib; segments
oblong, obtuse, entire, dilated at the base, and separated
by rounded sinuses ; veinlets free, or making occasional areoles;
s.ori near the margin.
1 incanum, S w a r t z , FI. Ind. Occ., iii., p. 16 4 5 ; Syn. Fil., p. 3 5 .
— S c i ik u h r , Krypt. Gew., p. 18 8 , t. 1 1 b {P . velatum). — W i l l d
enow, Sp. PI., V., p. 1 7 4 . — P u R S ii, FI. Am. Sept., ii., p. 6 5 9 .—
G r a y , Manual. — M e t t e n iu s , Polypodium, p. 6 9 . — H o o k e r , Sp.
Fil., iv., p. 2 0 8 . — E a ton, in Chapman’s Flora, p. 5 8 8 . — G r i s e -
b a ch , FI. Brit. W. I., p. 6 9 9 . — H o o k e r & B a k e r , Syn. Fil.,
p. 3 4 6 .— F o u r n ie r , Mex. P I , Crypt., p. 8 3 . — W il l iam so n , Ferns
of Kentucky, p. 3 7 , t. v . — M e e h a n , Native Flowers and Ferns
of the U. S., p. 1 3 , t. 4.
M a rg ina ria incana, P r e s l , T e n t . P t e r id ., p. 18 8 .
Goniophlebium incanum, J. S m ith , “ in Hooker’s Jour. Bot., iv., p. 56.”—
B r a c k e n r id g e , Filices of U. S. Expl. Exped., p. 32.
Lepicystis incana, J. S m ith , “ in Lond. Jour. Bot., ¡., p. 195 Ferns, Brit,
and Foreign, p. 80.
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