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munitum are A . Lonchitis, figured and described in our last part,
and A . acrostichoides of the eastern side of the continent. From
the former it is distinguished by the usually long and narrow
pinnæ, and by the usually much taller fronds being scarcely
narrowed at the base. From the latter it differs in the frond
being heavier and more coriaceous, and especially in the narrower
pinnæ, which are not contracted when they bear fruit.
A much closer resemblance exists between our fern and the
A . falcinelluni of Madeira. In that species the scales of the
stalk are very dark-brown, the pinnæ with a more evident petiole,
the auricle obtuse, the serratures not aculeate, and the indusium
with a dark spot in the middle. The pinnæ also have a
tendency to become auricled on the lower side of the base, as
well as the upper.
Since our present fern extends to the fiftieth degree of north
latitude, and, as Ruprecht thinks, probably much farther north,
it is not improbable that it might do well in open-air cultivation
in New England.
Plate XX V. — Aspidium munitum.. The left-hand figure represents a
normal but rather small specimen, from Oregon, collected by Mr. E. Hall.
The middle frond is var. nudatum, from the Yosemite, Professor Wood.
The figure to the right is var. imbricans, from Mendocino County, California,
Dr. Kellogg. The small portion of a frond at the top of the plate
is from a magnificent specimen collected in 1855 at Port Orford, Oregon,
by Lieutenant (now Colonel and Major-General by brevet) August V.
Kautz.
The indusium drawn is from this specimen.
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