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194 FERNS OF NORTH AMERICA.
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D e s c r ip t io n : — This species of Woodsia is so much like
W. Oregana that unless the specimens are in good condition
it is very difficult to distinguish one plant from the other.
The general habit is the same; the scales of the root-stock
and of the lower part of the stalk are precisely alike, and
the color of the stalks is similar. In W. scopidiiia the stalks
and the lower surface of the frond are finely but not densely
pubescent with slender jointed hairs, as well as minutely
glandular with stalked glands. The fronds are often apparently
bipinnate, but the secondary rachises are narrowly
winged. The most important distinction is in the indusium,
which is not always in condition to admit of satisfactory examination.
It is deeply and irregularly cleft into lacinias, and
these are narrowed into rather short articulated hairs, or cilia,
the cells of which are irregularly cylindrical rather than globular.
The whole indusium is larger and more evident than
that of PV. Oregana, but far less so than in W. obhisa, of
which Mr. Baker thinks the present fern “ scarcely more than
a variety.”
The largest specimens arc from Minnesota and Colorado.
Plate LX X I, Fig. 9 - 1 2 .— Woodsia scoptdina, from Mono Pass,
collected by B o la n d e r . Fig. 10 is part of a pinna somewhat enlarged.
Fig. 1 1 is an indusium, the sporangia having been removed, and Fig.
12 is a spore.
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