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The veins form'three sets of areoles: — a series of very
long and narrow areoles running along both sides of the midrib
from the midvein of one lobe to the midvein of the next:
a series of shorter areoles running along both sides of the
midveins, and outside of these an irregular row of smaller
oblique areoles, from which free veinlets extend to the spinii-
lose serratures.
The sori are found filling some of the areoles of the
first and second series. The indusium is attached to the
veinlet forming the outer boundary of the areole, and covers
the sporangia until they mature, when it is refiexed. The
spores are ovoid and marked with a single vitta.
Plate L X I .— Woodwardia radicans, a rather small frond, from
California. Fig. 2 represents two segments of the natural size from a
large specimen. Fig. 3 is a spore.
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