[Illustration: Christmas Fern. Polystichum acrostichoides Top, Forked Form; Bottom, Incised Form (Maine)]
(2) BRAUN'S HOLLY FERN
Polystichum Bráunii. Aspídium aculeàtum Bráunii
Fronds thick, rigid, one to two feet long, spreading, lanceolate, tapering both ways, bipinnate. Pinnules ovate or oblong, truncate, nearly rectangular at the base, sharply toothed and covered beneath with chaff and hairs. Fruit-dots small and near the mid veins. Indusium orbicular, entire. Stipes chaffy with brown scales.
[Illustration: Braun's Holly Fern. Polystichum Braunii (Willoughby Mountain, Vt.) (Herbarium of G.H.T.)]
This handsome fern is rather common in northern New England. We have collected it in the Willoughby Lake region, Vt., and it is found at Mt. Mansfield, Randolph, and elsewhere in that state; also at Gorham, N.H., and Fernald reports it as common in northern Maine. It also grows in the mountains of New York and Pennsylvania, and westward. It was formerly thought to be a variety of the prickly shield fern (P. aculeàtum), which has a very wide range and numerous varieties. The fronds remain green through the winter but the stipes weaken and fall over.
(3) HOLLY FERN. Polystichum Lonchìtis
Fronds linear-lanceolate, short-stalked and rigid, eight to fifteen inches long. Pinnæ broadly lanceolate-falcate or the lowest triangular, strongly auricled on the upper side, densely spinulose-toothed. Sori midway between the margin and midrib.
