156 NATURAL HISTORY BULLETIN. 



robustum, and there is also an occasional faint trace of a 

 central carina on the ridges of the sheaths, which brings 

 these specimens still nearer to that species. It fruits in 

 May and June. The following counties are represented: 

 Lee (July, 1895; June, 1897); Linn (June, 1894, and 

 May, 1896; fruiting); Black Hawk (July, 1898); Cerro 

 Gordo (Mason City, July, 1896; Clear Lake, June, 1899, 

 the latter well-fruited) ; Winnebago (July, 1899) ; Emmet 

 {R. I. Cratty, July, 1886, fruiting; Sktmek, Sept., 1895) ; 

 Dickinson (July, 1897, fruiting) ; Webster (July, 1897) ; 

 Dallas (July, 1896); Adair (J. E. Gow, Aug., 1900); 

 Pottawattamie {J. E. Cameron, May, 1896) ; Woodbury 

 (Aug., 1900); and Lyon (Rock Rapids, Aug., 1897; 

 northwest corner, June, 1897, fruiting; Granite, June, 

 1897, fruiting). 



Class II. FILICES (L.) Swartz, (1. a). 



Sub-class I. EUSPORANGIATjE Goebel. 



Order I. OPHIOGLOSSACE/E Lindl.* 



Genus B O T R Y C H I U M Swartz, Schrad. Jour. Bot. 

 vol. II, p. 8 (1800). 



1. BOTRYCHIUM VTRGINIANUM (L.) Swz. 



This species, while nowhere gregarious, is widely 

 distributed through the wooded portions of the State. It 

 prefers deeper shade, but may sometimes be found in more 

 open woods. Specimens from the following counties are 

 in the herbarium: Johnson (June, 1891; May, 1894; 

 May, 1896) ; Black Hawk {Miss Minnie Howe) ; Henry 

 {J. H. Mills); Shelby (T. J. Fitzpatrick, June, 1894); 

 Jones {T. H. Macbride, Aug., 1895; J. E. Cameron, 



On authority of Underwood (1. c. ) 



