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apex, and, consequently are rather nearer the margin than the
midvein. The indusium is attached beneath the sporangia,
and at first nearly or quite encloses them,.as in a subglobose
pouch; but as the sporangia mature it splits into from four
to six irregular and jagged lobes, which extend out beyond
the sporangia. It is very delicate in texture, and, in a per
fectly ripe frond, is very difficult to find. It is very badly
represented in Schkuhr’s plate 43^, but is well shown in the
drawing published by Hooker & Greville. The ring has sixteen
to eighteen joints. The spores are dark-colored, ovoid
and narrowly iving-margined.
The genus Woodsia, as characterized by Robert Brown,
was limited to the species in which the indusium is divided
nearly to the centre into ciliary processes; and the present
species was placed by different authors in five or six different
genera, before it was finally referred to Woodsia, in which
it is one of the few species constituting the section Physem-
atiiim, having a pouch-like indusium which splits into radiating
lobes. The specific name Perriniana was founded on
an error, which is explained in Dr. Torrey’s Flora of New
York. Specimens sent by him from New York were placed
by Sprengel in a West-Indian collection made by Perrin. It
is strange, however, that Sprengel failed to recognize his
own Polypodium obtustim.
The specimen figured was collected near Boston, by Tlr . Faxon.
The details are a portion of a pinna, a sorus and a spore.
P l a t e LX X I.—F ig . 9 - 1 2 .
WOODSIA SCO PU L IN A , D. C. E a t o n .
Rocky-Mountain Woodsia.
W o o d s ia s c o p u lin a Root-stocks short, creeping, chaffy,
forming iarge tufts or patches ; stalks two to four inches high,
not jointed, bright-ferruginous near the base, paler and stramineous
upwards, puberulent, like the rachis and the under
surface of the frond, with minute jointed hairs and stalked
glands; fronds lanceolate-oblong, four to eight inches long
pinnate; pinnæ numerous, eight to fifteen lines long, oblong-
ovate, sub-acutc, deeply pinnatifid with five to eight pairs of
short ovate or oblong obtuse crenulate or toothed divisions;
sori sub-marginal; indusium very delicate, deeply cleft into
narrow segments which terminate in short hairs composed of
irregular cylindrical cells.
Woodsia scopidina. E.4T0N, in Canad. Naturalist, ii., p. 91 ; Botany o f
U. S. Geol. E x p l of 40th Parallel, p. 397 ; Ferns of the Southwest,
p. 337. — t lo oK E R & B .ik e e , Syn. Fil., ed. ii., p. 4 8 .—
P o r t e r & C o u l t e r , Syn. Fl. Colorado, p. 154.
Woodsia obtusa, G ray, Enum. P I of Rocky Mts., in S ill Jour, xxxiii.
(186 2), p. 253, not of Torrey.
H ab. Growing in dense masses on rocks and in crevices, from
Oregon to Mono Pass, California ( B o l a n d e e ) , and extending eastward
to Dacotah, Minnesota and Colorado.
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