16 T. J. W. BURGESS ON RECENT 
mens presents, in its upper two-thirds, a marked resemblance to A. munitum, having nar- 
row and wide-spreading, nearly sessile pinnæ, which are almost destitute of falcateness. 
Their teeth, too, are incurved and almost free from the bristle points, which give so for- 
midable an appearance to typical A. lonchitis. All this gentleman’s other specimens that I 
have seen, from the same locality, are in every respect normal, except that the stalks of 
some of them are longer than is usual in this species. On the upper slopes of Cathe- 
dral Mountain at Kicking Horse Lake, B. Col., and on the snowslides near the summit 
of the Selkirk Mountains, B. Col Macoun. 
12.—A. ACROSTICHOIDES, Swz. A peculiar form of this was found by Mr. Peter Jack 
near Halifax, N.S. The whole of the fronds had the edges of the pinnæ crinkled or 
crimped, while their points were rounded. In other respects, the specimen sent me, which 
was barren, resembled the type. Some additional New Brunswick stations are “ Upper 
Tobique and Kennebeccasis,—Hay ; Mosquito Cove,—Mrs. Heustis ; Andover, common at 
Salmon River,— Wetmore.” (Fowler, in Bull. Nat. Hist. Soc. N. B., No. IV) 

14—A. ACULEATUM, Swz., (Prickly Shield-Fern, Hard Prickly Shield Fern), Syn. Fil, 
53. Willdenow, Sp. PI, V. 258. Hooker, Sp. Fil., IV. 18. Milde, Fil. Eur. et Atlant. 
104. Hook. and Baker, Syn. Fil., 252. Eaton, Ferns of N. A., Il. 123. Underwood, Our, 
Nat. Ferns, etc., 103. 
A. aculeatum, a lobatum, Hook. 
A aculeatum, var. lobatum, Kunze ; Eaton, Ferns of N. A., II, 124. 
A. lobatum, Smith ; Swartz, Syn. Fil., 53. 
A. lobatum, a vulgare, Doell. 
Polystichum Plunkeneti, DC. 
Polystichum aculeatum, Pres]. 
Polystichum aculeatum, var. lobatum, Moore. 
Polypodium aculeatum, Fries. 
Polypodium lobatum, Huds. 
A handsome, evergreen, prickly-looking fern, found growing among rocks or in rocky 
ravines, generally in mountainous districts. It attains a height of one to three feet, the 
fronds forming a crown. Rootstock stout, erect or ascending, covered with old stalk- 
bases ; stalks variable in length but considerably shorter than the fronds, very chaffy 
with largeand small brown scales intermixed, as is the rachis and usually its branches ; 
fronds one to two feet long, dark-green, rigid, subcoriaceous, more or less. chaffy-fibrilose 
beneath, lanceolate or oblong-lanceolate, tapering to the apex and also toward the base, 
pinnate; pinne lanceolate from a broad base, acute, generally curved upward (some of 
the lower sometimes horizontal or deflexed) incisely pinnatifid or again pinnate; pin- 
nules obliquely set, variable in shape, rhomboid-oval and sessile or unequally triangular- 
ovate and auricled on the upper side of a slightly stalked base, the superior basal ones 
generally much larger than the next and more distinctly auricled, serrate with the teeth 
aculeate in varying degrees ; sori in two rows on the segments, nearer the midvein than 
the margin. 
Professor Eaton states that the difference between typical A. aculeatum and var. lobatum 
is only that usually seen between the fronds of mature (therefore more divided) and 
younger plants, and includes in var. /obatum, like Kunze and Milde, both these forms. Ihave 
