s it splits into fragments. Var.
_angusta_ is a form with very narrow fronds and pinnae. Highlands, New York.
The type grows in Middlesex County, Mass., but is rare.

(4) SMOOTH WOODSIA. _Woodsia glabella_

Fronds two to five inches high, very delicate, linear, pinnate. Pinnae
remote at the base, roundish-ovate, very obtuse with a few crenate lobes.
Stipes jointed, straw-colored. Hairs of the indusium few and minute.

[Illustration: Smooth Woodsia. _Woodsia glabella_ (Willoughhy Mountain, Vt.
G.H.T.)]

On moist, mossy, mostly calcareous rocks, northern New England, Mount
Mansfield, Willoughby, and Bakersfield Ledge, Vt., Gorham, N.H., also
Newfoundland, New York, and far to the northwest. Not very common. It
differs from the alpine species by the absence of scales above the joint.
As the name implies, the plant is smooth, except for the chaffy scales at
or near the rootstock, which mark all the Woodsias, and many other ferns,
and which serve as a protective covering against sudden changes in extremes
of heat and cold.

(5) OREGON WOODSIA. _Woodsia oregana_

Fronds two to ten inches high, smooth, bright green, glandular beneath,
narrowly lance-oblong, bipinnatifid. Pinnse triangular-oblong, obtuse,
pinnatifid. Segments ovate or oblong, obtuse, crenate, the teeth or margin
nearly always reflexed. Indusium minute, concealed beneath the sorus,
divided into a few beaded hairs.

Like the obtuse Woodsia this fern has no joint near the base of the stipe,
but is much smaller and has several points of difference. Limestone cliffs,
Gaspe Peninsula, southern shore of Lake Superior, Colorado, Oregon to the
northwest. Its eastern limit is northern Michigan.

(6) ROCKY MOUNTAIN WOODSIA. _Woodsia scopulina_

Fronds six to fifteen inches long [smooth], lanceolate, pinnatifid. Pinnae
triangular-ovate, the lowest pair shortened. Under surface of the whole
frond hispidulous with minute, white hairs and stalked glands. Indusium
hidden beneath the sporangia, consisting mostly of a few hair-like
divisions.

In crevices of rocks, mountains of West Virginia, Gaspe Peninsula, Rocky
Mountains, and westward to Oregon and California.

(7) CATHCART'S WOODSIA. _Woodsia Cathcartiana_

Fronds eight to twelve inches high, lanceolate, bipinnatifid, finely
glandular-puberulent. Pinnse oblong; the lower distant segments oblong,
denticulate, separated by wide sinuses.

Rocky river banks, west Michigan to northeast Minnesota.

DENNSTAE