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OWOGLEA S T R U T H IO P T E R I S . Hoffmann,
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F E R N S OF NORTH AM ER IC A .
P late L X X III.
ONOCLEA S T R U T H IO P T E R IS , H o ffm an n .
Ostrich-Fern.
O n o c le a S t r u t h io p t e r i s : — Caudex short, thick, erect,
emitting slender subterranean stolons; stalks stout, a few
inches to a foot long, chaffy at the base ; fronds standing in
a vase-like crown, dimorphous; sterile ones one to ten feet
high, herbaceo-membranaceous, broadly lanceolate, narrowed
from the middle to the base, abruptly short-acuminate, pinnate;
pinnæ very many, sessile, the lowest ones sinuate and deflexed,
the rest three to eight inches long, five to nine lines wide,
linear-lanceolate, acuminate, deeply pinnatifid into numerous
close-placed oblong obtuse entire segments provided with a
midvein and several simple veinlets on each side ; fertile
fronds in the middle of the crown or vase, much shorter
than the sterile, rigid, contracted, narrowed at the base, pinnate;
pinnæ one to two inches long, crowded, obliquely
ascending, linear, obtuse, sub-entire or pinnately lobed, the lobes
one or two lines long and broad, the margins much recurved,
and the whole pinna forming a- somewhat articulated pod-like
body; veinlets of the fertile segments few, soriferous on the
back; receptacle elevated; indusium very delicate, laceratetoothed,
half surrounding the sorus; sporangia at length confluent
and filling the fertile pinnæ.
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