_Woodsia alpìna. Woodsia hyperbòrea_

Fronds narrowly lanceolate, two to six inches long, smooth above, somewhat
hairy beneath, pinnate. Pinnæ triangular-ovate, obtuse, lobed, the lobes
few and nearly entire. Fruit-dots rarely confluent. Indusium as in _Woodsia
ilvensis_.

[Illustration: Details of Northern Woodsia. _Woodsia alpina_]

Thought by some botanists to be a smooth form of _Woodsia ilvensis_. It
was discovered in the United States by Horace Mann, in 1863, at Willoughby
Lake, Vt. Twenty years or more later it was collected by C.H. Peck in the
Adirondacks, who supposed it to be _Woodsia_ _glabélla_. In 1897 it was
rediscovered at Willoughby Lake by C.H. Pringle. New York, Vermont, Maine,
and British America. Rare.

[Illustration: Northern Woodsia, _Woodsia alpina_ (From Waters' "Ferns,"
Henry Holt & Co.)]

(3) BLUNT-LOBED WOODSIA. _Woodsia obtùsa_

Fronds broadly lanceolate, ten to eighteen inches long, nearly twice
pinnate, often minutely glandular. Pinnæ rather remote, triangular-ovate
or oblong, pinnately parted into obtuse, oblong, toothed segments.
Veins forked. Fruit-dots on or near the margin of the lobes. Indusium
conspicuous, at length splitting into several spreading, jagged lobes.

[Illustration: Blunt-lobed Woodsia. _Woodsia obtusa_]