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68 F E R N S O F NO R TH AM ER IC A .
icate than the frond itself. ' The sporangia are comparatively
scanty, and are fully covered by the involucre. The spores
are spheroid-tetrahedral and obscurely trivittate.
Mr. Moore and some other authors are disposed to insist
on the right of priority belonging to the specific name
Stelleri. But the name gracilis has been used by nearly
every writer on American Ferns since the time of Michaux,
and will most probably be kept up rather than the other.
It should be noted that Ruprecht considered his 'Allosorus
Stelleri to be distinct from our plant, and mentions
several points of difference in his work on the Distribution
of Vascular Cryptogamia in the Russian Empire.
The figure is taken from specimens collected in Sunderland, Hampshire
County, Massachusetts, by the late Rev. David Peck.
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