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184 F E R N S OF NORTH AM E R IC A .
The pinnæ are incised more than half way to the midrib into
very numerous obliquely-oblong, sub-acute, often curved
segments.
The veins are simple, and usually from seven to ten pairs
to each segment. The lowest ones of adjoining segments are
curved and either extend to the bottom of the sinus separating
the segments, or unite between the bottom of the sinus
and the midrib, and send out a ray to the sinus. As I find
all intermediate conditions in the disposition of the veins I
am unable to separate the specimens into two species.’ The
sori are rather small and are placed on the back of the veins
about midway between the midvein and the margins, or sometimes
nearer the margins than the midvein. The indusia are
round-reniform and pubescent with hairs like those of the
frond. The bean-shaped spores are very dark-brown, and
have a verrucose surface.
Plate LX X .— Aspidium -patens. The principal figure is from a- frond
collected near Mobile, Alabama, by Mr. Charles Mohr. Pig. 2 is a portion
of a pinna, enlarged and showing the venation, etc. Fig. 3 is an
indusium, and Fig. 4, a spore. Fig. 5 is a pinna from a Florida specimen,
sent by Dr. Chapman, showing the anastomosing basal veins. Fig.
6 is an enlarged portion of the same.
’ Mettenius has this note ;—•• Specimina boreali-atnericana, rhizontate destituía,
inolliter hirsuta, n erv is connivantibus vet arcum Goniopteridis forman tibus, ex speci-
viinibus completis describenda c ru iii.” But I urn persuaded that all are forms o f one
species.
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