536 
Cystopteris fragilis (L.) Bernh, Schrad. Neues Journ. Bot. i, pt. : 2, 27 (1806); 
Polypodium fragile L. Sp. P1. ii, 1091 (1753). 
Throughout the Black Hills: Little Elk, altitude 1,100 m., June 27; Lead City, 
altitude 1,600 m., July 6; Custer, altitude 1,700 m., August 15 (No. 1198). 
Woodsia oregana Eaton, Can. Nat. ii, 90 (1865), 
Common throughout the Black Hills: Hermosa, altitude 1,100 im., “June 23; Elk 
Canyon, altitude 1,200 m., June 29; Custer, altitude 1,700 m., August 10 (No, L199). 
Woodsia scopulina Eaton, Can, Nat. ii, 90 (1865), 
On wooded hillsides south of Custer, altitude 1,700 m., August 10 (No. 1200). 
Onoclea sensibilis L. Sp. Pl. ii, 1062 (1753). 
In Gray’s list, Newton & Jenney’s Report.! Also collected by Prof. J. A. Williams, 
near Rapid City. 
Onoclea struthiopteris (L.) Hoffm. Deutsch. FI. ii, 11 (1795); Osmunda struthiop- 
teris L. Sp. Pl. 1066 (1753). 
In Gray’s list only. 
EQUISETACE. 
Equisetum arvense L. Sp. Pl. 11, 1061 (1753). 
Unusually robust specimens, in damp woods below Sylvan Lake, altitude 1,800 m., 
June 8 (No, 1201), 
Equisetum sylvaticum L. Sp. P). ii, 1061 (17538). 
With the preceding, June-8 (No, 1202), 
Equisetum levigatum A. Br.; Engelm. Amer, Journ, Sei. xlvi, 87 (1844). 
The two forms collected in Nebraska were also found here. The more robust with 
sessile spike, No. 1260 of my Nebraska collection, was collected in Elk Canyon, alti- 
tude 1,200 m., June 29 (No. 1203). The other one, of the same form as No. 1283 of the 
Nebraska collection, was found at Hot Springs, altitude 1,050 m., August 3 (No. 1204), 
' Geol. Surv. Black Hills, 557 (1880). 
