192 MACOUK AND BURGESS OET 



G. M. Dawson. Ottawa, Out. — J. Fletcher. Lake Medad, near Hamilton, Ont. — Logie. 

 Rocks just below the Falls and near the Whirlpool, Niagara River, Ont. — Burgess. East 

 coast of Hudson Bay — R. Bell. 



3. — A. ebeneum, Ait., (Ebony-Spleenwort), Swartz, Syn. Fil., 79. Torrey, Fl. N. Y., 

 II, 492. Gray, Man., 661. Provancher, Flor. Can., 716. Lawson, Can. Nat., I, 276. 

 Macoun's Cat., No. 2297. Eaton, Ferns of N. A., I, 21. Underwood, Our Nat. Ferns, 

 etc., 98. 



A. poiypodioides, Swartz, Syn. Fil., 79. 



A. trichomanoides, Miehx., Fl. Bor.-Am., II, 265. 



Acrostichum platyneuron, L. 



A slender, elegant, evergreen little plant, 6 to 20 inches high, growing on shaded 

 rocks, or in open rocky woods. Rootstock short, creeping, covered with old stalk-bases ; 

 stalks short, dark brown or almost black, and polished, as is the rachis ; fronds smooth, 

 erect, I to 1| inches broad, linear-lanceolate in outline, and pinnate ; pinnae numerous, 

 sessile, mostly alternate, serrate, oblong or lanceolate (often somewhat scythe shaped), 

 dilated or auricled usually on the upper but sometimes on both sides of the base, and 

 horizontal, or the lower gradually becoming shorter and deflexed ; sori numerous and 

 approximate to the midvein ; indusia very delicate. 



In this spleenwort, also, forking fronds, as well as slight variations in the shape and 

 toothing of the pinnae, are at times met with, and a form with large fronds and incised 

 pinnae is var. serratum, Miller. 



The number of localities known in Canada for this fern are but few and confined to 

 the Province of Ontario. Rocky woods, Brockville, Out. — B. Billings. Crevices of Lauren- 

 tian rocks a little to the north of Shannonville Station on the Grand Trunk Railway, nine 

 miles east of Belleville, Ont. ; Gibson Mountain, a mass of metamorphic rock, four miles 

 south of Belleville, Prince Edward Co., Out. — Macoun. Point A/bino, Lake Erie, Ont. — 

 D. F. Day. 



t f t Tall ferns with a green rachis and linear-lanceolate, acute pinnae. 



4. — A. angtjstifolttjm, Mx., (Narrow-leaved Spleenwort, Swamp-Spleenwort), Swartz, 

 Syn. Fil., 76. Pursh, II, 666. Gray, Man., 662. Lawson, Can. Nat., I, 275. Macoun's 

 Cat., No. 2298. Eaton, Ferns of N. A., II, 73. Underwood, Our Nat. Ferns, etc., 99. 



A pycnocarpon, Spreng. 



This fern is found in low, rich woods, commonly varying from J to 3 feet high. The 

 barren and fertile fronds are somewhat unlike and are very sensitive to frost. Rootstock 

 smooth, creeping, and covered with old stalk-bases ; stalks erect, smooth, green when 

 fresh but brownish when dry, and dark coloured like the rootstock close to the base : 

 fronds 1 to 2 feet long by 4 to 8 inches wide, lanceolate or lanceolate-oblong in outline, 

 sometimes much contracted at the base, smooth, and pinnate ; pinnae numerous, short- 

 stalked, linear-lanceolate, acuminate, aud entire or crenulate, those of the fertile fronds, 

 which are taller than the sterile, being narrower and rounded instead of subcordate at the 

 base as in the sterile ; sori crowded, slightly curved, linear, and placed oblicpuely to the 

 midrib ; indusia firm. 



Little variation is seen in this species, but occasionally the pinnae are slightly serrate 



