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into from two to five veinlets. The sori are rather large,
placed nearer the midvein than the margin, and are rarely
produced towards the apex of the segments.
The indusium is orbicular-reniform, and almost always
smooth. Its edges are turned downward, enclosing the sporangia,
when they are young, and sometimes this convexity is
permanent. Rarely the sinus is so deep that the indusium
at last becomes divided. The spores are ovoid, and have a
miiricately roughened surface.
The rhizomes have been used for ages as an anthelmintic,
but probably have no greater virtue in this direction
than those of many other common species.
Plate X L I .— Aspidium Filix-mas, var. incisum. The figure is reduced
one-third, and is taken from one of Mrs. Roy’s fine Canadian
specimens. Other fronds from the same locality show the incising of
the segments in a much greater degree. At the top of the plate are
two segments enlarged, one from the base and the other from the
middle of the same pinna. The indusium is also represented.
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