190 MACOUN AND BURGESS ON 



midribs of both piuuœ and segments ; sori oblong, one to each aréole, and sunk in shallow 

 cavities in the frond, which cavities are covered by the lid-like indusia. 



W. Virginica is but very slightly variable and ijossesses no economic value. A speci- 

 men from Stony Lake, Ont., from the greater laxity of its parts, is more delicate in appear- 

 ance than usual, and has the pinnules obliquely triangular, about as broad as long, acutish, 

 and almost entire. 



This is rather a rare plant and one not known to range west of Lake Huron. North 

 West Arm and Dartmouth, Halifax Co., N. S. — Pœv. E. H. Ball. Roadside between Caledo- 

 nia and Liverpool, Queen's Co., and between Liverpool and Jordan River, Shelbourne Co., 

 N.S. — P. Jack. Near G-aspé Basin, Que. — 31. J. Eden. Near Heck's Mills, ten miles 

 from Prescott, Augusta Tp., Ont. — B. Billings. Peat swamps of the Mcr Bleu near 

 Ottawa, Ont. — /. Fletcher. Along the Canada Atlantic Railway, near Eastmaun's Springs, 

 Russell Co., Out. ; very abundant five miles north of Colborue village, Ont. ; common in 

 marshes at west end of Gull Lake, Addington Co., Ont. — Macoun. Near Millgrove, Went- 

 worth Co., Ont. — Logic. Lake Island, Lake Joseph, Muskoka, 0\\{.— Burgess. 



Genus X.— ASPLENIUM, i., Spleenwort. 



§ Indusia straight or nearly so, attached to the upper side of the vein, rarely a 

 few of them double. 



* Fronds once pinnate. 



i" Small ferns with a green rachis. 



1. — A. VIRIDE, Hudson, (Green Spleenwort), Swartz, Syu. Fil., 80. Hook., Fl. Bor.-Am., 

 II, 262. Hook, and Baker, Syn. Fil., 195. Lawson, Can. Nat., I, 275. Macoun's Cat., No. 

 2294. Fowler's N. B. Cat., No. V48. Goode, Can. Nat., IX, 300. Eaton, Ferns of N. A., I, 

 2*75. Underwood, Our Nat. Ferns, etc., 98. 



A. Trichomanes, L. 



A. inlermedium, Presl. 



The Green Spleenwort is a delicately herbaceous, though evergi-een, little fern, from 2| 

 to 10 inches high, growing in tufts in the clefts of shaded rocks. Rootstock short, creep- 

 ing, and scaly ; stalks slender, naked, reddish-brown at the base, but soon changing into a 

 green which is continued throirgh the rachis ; fronds li to G inches long by about i inch 

 wide, linear-lanceolate in outline, and pinnate ; pinnœ short-stalked, roundish-ovate or 

 rhomboidal, more or less cuneate at the base, entire on the lower margin, crenate or 

 incised on the outsides ; sori few and approximate to the midvein ; indusia very delicate. 



This fern is subject to slight A'ariation in the shape and toothing of the pinnse, and 

 in England a branched form, var. multifidum, Moore, is not infrequent in places. Speci- 

 mens from near St. John, N. B., agree with, except that they are even more robust than, 

 var. robustum of J. B. Goode in Can. Nat.. Yol. IX, p. 300 ; but except for their sturdiness 

 seem in no way specially noteworthy. Other specimens from the same locality show 

 fronds with the pinrnt remarkably distant. 



The range of this species westward is given by Eaton as New Brunswick to the 

 Rocky Mountains and British Columbia, while northward in the Rocky Mountains, 

 according to Drummond, it extends to Lat. 50°. Very rare, Tettagouche Falls, Gloucester 



