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Ill the Yucatan and Mexican specimens they are a little
larger, and if the figure at Plate Ixxv, B, of the Species
Filicum be really taken from Nuttall’s specimen, the pinnules
of his plant are still larger and more semicircular. Both
surfaces are pubescent with soft ivhitish hairs.
The involucres are of unequal size in the Texas plant,
as they are in those from Mexico and Yucatan, some of
them being four times broader than deep, others barely oblong,
and others roundish. They are brownish-yellow in color,
and even more pubescent than the pinnules themselves. The
spores are trigonous and plainly trivittate.
Plate LIX., Fig. b - io .~ A d ia n tum tricholepis. The frond represented
is from the Pecos River, in Western Texas. Fig. 7 shows an
enlarged pinnule. Fig. 8. a position of the margin of the same, with
the involucre turned back to show the position of the sporangia on the
tips of the veinlets. Fig. 9 is a spore, and Fig. 10, a part of a pinna
from a Yucatan specimen, of the natural size.
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