CANADIAN FILICINEJE. 193 



instead of crenulate, and cases where the fronds are forked at the summit are not very 

 uncommon. Fronds sterile in general appearance are frequently found bearing a few 

 fruit-dots on some of the pinnae. 



The Swamp-Spleenwort, which in Canada is limited in its distribution to Quebec and 

 Ontario, is rare in the former Province, but very common in the south-western part of the 

 latter. Nun's Island, Montreal, Que. — S. H. Parsons. Open woods, the Mountain, Mont- 

 real, Que. — D. R. McCord. Abundant in McKay's Woods, Ottawa, Out. ; frequent in rich 

 woods in Ameliasburg, Prince Edward Co., and in rich soil in low woods along Cold 

 ('reek, Brighton, Northumberland Co., Out. ; very common in woods west of Collingwood 

 and around Owen Sound, Out. — Macoun. Low woods up the Don Valley, Toronto; cedar 

 swamps and rich woods, London, Out. — Burgess. Rich woods, Amherstburg, Ont. — 

 Maclagan. 



# * Fronds more than once pinnate or pinnatifid. 



5. — A. thelypteroides, Mx., (Silvery-Spleenwort), Swartz, Syn. Fil., 82. Pursh, II, 

 66*7, Gray, Man., (362. Hook, and Baker, Syn. Fil., 22G. Provancher, Flor. Can., 716. 

 Lawson, Can. Nat,, I, 276. Macoun's Cat., No. 2299. Fowler's N. B. Cat., No. '749. Ball, 

 Trans. N. S. Inst, Nat. Sci., IV, 150. Eaton, Ferns of N. A, II, 33. Underwood, Our Nat. 

 Ferns, etc., 100. 



A. acrostichoides, Swartz , Syn. Fil., 82. 



Athyrium thelypteroides, Desv., Watt , Can. Nat., IV, 363. 



Diplazium thelypteroides, Presl. 



It is a rather pale-green, handsome, non-evergreen fern, commonly H to 3i feet 

 high, growing in deep, rich woods. Rootstock smooth, creeping, covered with old stalk- 

 bases, and very like that of A. august if olium ; stalks erect, tufted, chaffy when young, but 

 smooth or nearly so when mature ; fronds 1 to 2h feet long by 6 to 10 inches wide, 

 lanceolate or lanceolate- oblong in general outline, sometimes much contracted at the base, 

 often somewhat hairy on the veins, and pinnate ; pinnaa linear-lanceolate from an almost 

 sessile base, acuminate, and deeply pinnatifid ; segments oblong, obtuse, and minutely 

 toothed, the teeth often obscured by the edges having a tendency to turn under ; sori 

 crowded, oblong, slightly curved, the lowest one of a segment often double ; indusia firm, 

 and, when young, shining and silvery, giving from their abundance the same general hue 

 to the whole under surface of the frond. 



As a rule this fern is not variable, but a form occurs in which the segments are 

 crowded and deeply serrated, var. serratum, Lawson, Can. Nat., Vol. I, p. 2*7*7. 



It is not a very common species eastward, but is very abundant in most sections of 

 Ontario, and finds its present known western limit about Current River, Lake Superior. 

 Windsor, N. S.— Bow. Halifax, N. S.— Dr. Lindsay. Mt. Dalhousie, N. S.— A. H. McKay. 

 Strait of Canso ; Boylston, Guysborough Co. ; and Rawdon, Hants Co., N. S. — Rev. E. H. 

 Ball. Wentworth Station, Cumberland Co., and North Mountains, King's Co., N. S. — P. 

 Jack. Scarce in New Brunswick. — Fowler. Near Grand Falls and at Woodstock, N. B. — 

 P. Jack. Quebec, Que. — Hon. Wm. Sheppard. Montreal, Waterloo, Lennoxville, and in 

 Argenteuil Co., Que. — D. R. McCord. Richmond and Drummond Cos., Que. — J. A. Both- 

 well. Very common in Ontario. — Macoun, Logie, Burgess, etc. Alonir the Canada Pacific 



Sec. IV., 1S84. 25. 



