MEMOIRS OF THE NEW VORK BOTANICAL GARDEN. 467 



On page 5, before Pteris aquilina, insert the following three 



species : 



Pellaeaatropurpurea (L.) Link, Fil. Hort. Ber. 59 [111. Fl. i: 29; 



Man. R. M. 441] ; Pteris atrofurpurea L. Sp. PI. 1076. 



In rocky places, up to an altitude of 1000 m. 



Montana: Tenderfoot Creek, Belt Canon, 1885, R. S. Williams, 

 2^1, in part. 

 Pellaea densa (Brack.) Hook. Sp. Fil. 2 : 150 [111. Fl. i : 30 ? Man. 



R. M. 441 ; Bot. Cal. 2 : 340] ; Onychiiim densum Brack. Fil. 



U. S. Expl. Exped. 120. 



On rocks, up to an altitude of 2000 m. 



Montana: McDonald's Lake, 1895, R. S. Williams, lojp. 



Pellaea Stelleri (S. G. Gmel.) Watt, Can. Fil. no. 2 [111. Fl. i : 29] ; 

 Finis Stelleri S. G. Gmel. Nov. Com. Acad. Petrop. 12: 519; 

 Pellaea gracilis Hook. Sp. Fil. 2: 138 [Man. R. M. 441]. 

 On rocks, up to an altitude of 2000 m. 

 Montana: Camass Lake, 1895, 7?. S. Williams, 1038. 



After Pteris aquilina add : 



* Pteris aquilina lanuginosa Bong. Veg. Sitch. 176 [Bot. Cal. 341]. 



Lower surface of the frond decidedly pubescent and the fronds 

 generally pinnate instead of ternate. 



Yellowstone Park : Gibbon River, 1888, R. S. Williams. 



On page 8, after LYCOPODIACEAE, insert: 



* Lycopodium Selago L. Sp. PI. 1102 [111. Fl. i : 40]. 



A low species with all the leaves alike and the sporangia borne in 

 the axils of those a little above the middle of the stem. In moist 

 places among rocks. 



Montana: Lake Terry, 1895, R. S. Williams, 1062. 



* Lycopodium obscurum L. Sp. PI. 1102 [111. Fl. i: 41] ; Lycopo- 



dium dcndroideiim Michx. Fl. Bor. Am. 2: 282. 



A bushy and erect species with the sporangia in sessile spikes ; 

 leaves of the fertile stems scale-like and unlike those of the sterile. 

 In moist woods, up to an altitude of 2000 m. 



Montana: McDonald's Lake, 1892, R. S. Williams, 926. 



* Lycopodium complanatum L. Sp. PI. 1104 [111. Fl. i : 43]. 



A divaricately branched species wath mostly 4 spikes on a long 

 peduncle, flattened stems, and 4-ranked leaves, of which those of the 



