536 



Cystopteris fragilis (L.) Bonili. Sclinwl. Xeiies Joiirii. Hot. i. pt. 2, 27 (1806); 

 J'oli/podiuiii/rat/ilc L. Sp. I'l. ii, lOiU (1753). 



Tlironyliout the lihuk Hills: Little Elk, iiltitmlo 1,10() ni., Juno 27; Lcail Cit\, 

 altitude l,(iOO m., July 6; Custer, ivltitude 1,700 m., Auj^ust 15 (No. 119«). 



"Woodsia oregana Katou, Can. \at. ii, 90 (1<^65). 



Coiiimou tliinughout the Black Hills: Ileruioea, altitude 1,100 ni., Juno 2'A; Klk 

 Canyon, altitude 1,200 ni., June 29; Custer, altitude 1.7110 in., August 10 (No. IIO;)). 



"Woodsia scopulina Eaton, C:in. Nat. ii, 90 (1865). 



On -vvoodrd hillsides south of Custer, altitude 1,700 ni., August 10 (No. 1200), 



Onoclea sensibilis L. Sp. Tl. ii, 1062 (1753). 



lu (Cray's list, Xewtou A: Jenney's Report.' Also collettfd by I'rof. .J. A. Williams, 

 near Kapid City. 



Onoclea struthiopteris (L.) HotVui. Dcutsch. I'l. ii, 11 (1795); O-smmuhi slruthiop- 

 tcris L. .Sp. PI. 1066 (1753). 



In Gray's list only. 



EQUISETACEiE. 



Equisetuni arvense Ij. 8p. PI. ii, 1061 (1753). 



Unusually robust specimens, in damp woods below Sylvan Lake, altitude 1,800 in., 

 Juno 8 (No. 1201). 



Equisetum sylvaticum Ij. Sp. PI. ii, 1061 (1753). 



With the preceding, June 8 (No. 1202). 



Equisetuni laevigatuni A. Br. ; Engelni. Anier. Journ. Sci. xlvi, 87 (1844). 



The two forms collected in Nebraska were also found here. Tlie more robust with 

 sessile spike, No. 1260 of my Nebraska collection, was collected in Elk Canyon, alti- 

 tude 1,200 ni., June 29 (No. 1203). The other one, of the same form as No. 1283 of the 

 Nebraslva collection, was found at Hot Springs, altitude 1,059 ni., August 3 (No. 1204). 



' Geol. Surv. Black Hills, 537 (1880). 



