ADDITIONS AND CORRECTIONS. 



On page i, before Botrychium Coulteri, insert: 

 Botrychium Lunaria L. Sp. PI. 1064 [111. Fl. i : 3 ; Man. R. M. 



438]. 



In wet places, up to an altitude of 2000 m. 



Montana: St. Mary's Lake, 1897, R. S. W/lliains. 



On page 4, before Asplenium Filix-foemina, insert : 



* Phegopteris alpestris (Hoppe) Mett. Fil. Hort. Lip. 83 [Bot. Cal. 



2: 345] ; Asf)/d/iiin alpestre Hoppe, Taschenb., 1805, according 



to Svv. Syn. Fil. 421. 



A species much larger than P. Dryopteris, with oblong-lanceolate 

 fronds with bipinnatitid pinnae. Among rocks, at an altitude of about 

 2000 m. 



Montana: Head of MacDonald's Lake, 1895, R. S. Williams^ 

 1061. 



Asplenium Trichomanes L. Sp. PI. 1080 [111. Fl. i : 24 ; Man. R. 

 M. 442]. 



On rocks, up to an altitude of perhaps 2000 m. 

 Montana : Columbia Falls, 1894, R. S. WiUianis^ i'^4-5- 



Before Cheilanthes Feci, insert: 



* Cheilanthes gracillima DC. Eaton, Bot. Mex. Bound. Survey, 234 



[Bot. Cal. 2: 337]. 



Like C. Feci, but more slender, less woolly beneath, and with a 

 lighter color; indusia yellowish brown, forming a continuous 

 recurved margin; pinnules oblong-oval, 1.5—2 mm. long. In rocky 

 places. 



Montana: McDonald's Lake, 1895; R. S. Williams, 1060. 



Instead of * Pellaea pumila read : 



* Pellaea occidentalis (A. Nelson) ; Pellaea atroptirpurca occideu- 

 talis A. Nelson, Fern Bulletin, 7: 30. 



Prof. Aven Nelson published the same plant under a different 

 name while this memoir was in press ; hence the change. 



466 



