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This is now admitted by all pteridologists to be a distinct
species ; though it was formerly confounded with the Camptosorus,
from which it is clearly distinguished by the free veins, the mostly
single indusia, and the usual absence of a proliferous bud at the
apex of the frond. Some of the less compound and more attenuated
forms of A . montanmn come much nearer to i t ; but in its
simplest form this other species always has the fronds fairly pinnate,
and its more compound forms resemble t\\Q A . pinnatifidum
very little.
I take occasion to express my thanks to Hon. Thomas M.
Peters of Moulton, Alabama, who has sent me abundant and fine
specimens of this fern and of other rare species which are found
in the northern part of Alabama.
In Plate VIII., Fig. 2, Mr. Emerton has represented a portion o f one
of the Alabama plants, together with a part of a frond moderately enlarged,
to show the venation and sori.
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