176 TWELFTH ANNUAL REPORT. 



P. hexagouoptera, F^e. Hexagon Beech -Fern. 



Dulutli (plentiful), Miss Cathcart; and thiough the south half of the state, but rare. 



P. Dryopteris, F6e. Oak -Fern. 



North of lake Superioi- (common), Roberts; St. Louis river, Mrs. Herrich; St. Croix 

 riyev, Parry, Miss Field; Taylor's Falls (plentiful). Saint PauUrare), ilffes Cathcart. 

 [Manitoba, Macoun.] 



P. calcarea, F6e* (P. Dryopteris, F6e, var. Robertianum, Davenport.) 

 Beech-Fern. 

 "Collected in eastern Minnesota, growing on slaty rocks on the [west] bank of the 

 St. Louis river, near [close north of] the crossing of the Northern Pacific Railway, by 

 Miss Ellen W. Cathcart. Formerly attributed to America, but not clearly known as 

 American till now. It is rather common In Europe, and has been found in the Hima- 

 layan regions of Asia. It will probably be found from Lake Superior to Idaho. This 

 fern is very closely related to the common P. Dryopteris, and is often considered a var- 

 iety of it." Eaton's Ferns of North America : 1880 ; vol. ii. p. 277. Since this was writ- 

 ten, a second locality of this fern has been discovered by Mr. E. W. Holway at De- 

 corah, Iowa, where it occurs only upon a space about six feet square, "in the crevices 

 of the north side of a limestone bluff." Arthur; Bulletin of Torrey Botanical Club, 

 vol. ix, p. 50. Still more recently it has been collected by Prof. J. Macoun in Anticostl 

 island, and by Dis. Q. M. Dawson and B. Bell in the country around and to the east of 

 the lake of the Woods. Science, vol. iii, p. 676 (June 6, 1881). 



ASPIDIIJ]^, Swartz. Shield-Fern. Wood-Fern. 



A. Thelypteris, Swartz. IMarsh Shield-Fern. 

 Common, or frequent, throughout the state. 



A. No veboracense, Swartz. New York Shield- Fern. 



Stearns county, Campbell; lake Pepin, Miss Manning. Infrequent. East. 



A. fragTaiis, Swartz. Fragrant Wood-Fern. 



Isle Royale, Dr. Lyons; Duluth and Taylor's Falls, Miss Cathcart; Kettle river in 

 T. 42, R. 20, Pine county, Upham; falls of the St. Croix, Parry; Pipestone quarry, Mrs. 

 Bennett. [Nebraska, ^u^hcy.] North and southwest. 



A. spinulosum, Swartz. Spinulose or Common Wood-Fern. 



Throughout the state, but rare. Lapham. Duluth, Miss Caf/icart; lake of the 

 Woods, Daivson. 



A. spimilosum, Swartz, var. mterniedium, Eaton. Spinulose or Com- 

 mon Wood-Fern. 

 Common, or frequent, throughout the state, excepting far southward. Ramsey 

 county, Simmons; Pine county, etc., Upham. [North of lake Superior, Agassiz; Nebras- 

 ka, Aughey.'i 



A. spinulosiini, Swartz, var. (lilatatiini, Hornemann. Spinulose or 

 Common Wood- Fern. 

 Throughout the state, excepting far southward. Falls of the St. Croix, Parry; 

 Duluth, Miss Cathcart; Cascade river, north of lake Superior, Roberts. [Manitoba, 

 Macoun; Nebraka, Aughey.] 



*Phegopteki8 calcarea, Fee. Rootstock slender, cord-like, widely creeping ; 

 stalks scattered, slender, glandular, chaffy near the base, six to twelve inches high ; 

 fronds herbaceous, rather rigid, minutely glandular, deltoid, four to eight inches long 

 and about as broad at the base, ternate ; primary divisions stalked, pinnate with ob- 

 long or ovate-oblong pinnae, which are pinnately lobed or divided ; lowest inferior 

 pinna of the lateral divisions about equal to the third pinna of the middle division ; 

 lobes oblong, obtuse, creuately toothed, or it very large, pinnately lobed ; veins pin- 

 nately branched, sori small, nearer the margin than the mldvein. Eaton's Ferns 

 of N. A. 



