160 NATURAL, HISTORY BULLETIN. 



1891, "from wooded island opposite Fairport") ; Ringgold 

 county (July, 1890, sterile) ; Delaware county (J. E. 

 Cameron, Sep., 1897, sterile); and Linn county, (July, 

 1898). 



Genus STRUTHIOPTERIS Wtlld., Mag. Ges. Nat. 



Fr. Berl., p. 160 (1809). 



STRUTHIOPTERIS STRUTHIOPTERIS (L.) . 



Quite widely distributed in the State. It prefers moist 

 banks and alluvial (more or less sandy) flats. Specimens 

 have been received from the following counties: Johnson 

 (June, 1891; Sept., 1894; F. S. Aby , no date); Jackson 

 {T. H. Macbride, Aug., 1883); Muscatine {F. Reppert, 

 no date; Shimek, Oct., 1900); Shelby {T. J. Fitzpatrick, 

 May, 1894); Webster (July, 1897, sterile). 



Genus CYSTOPTERIS Bernhardt, Schrad. Neu. 

 Jour. Bot. vol. I, pt. 2, p. 26 (1806). 



Cystopteris fragilis (L.) Bernh. 



One of the most common ferns in the State. It appears 

 early in clumps of hazel-bushes, etc., most commonly in 

 rather low, rich woods, and begins to fruit in June or even 

 in May. Occasional fruiting specimens may be found in 

 favorable localities all summer long, but most of the fronds 

 wither and die by the end of July. If a wet autumn follows 

 a long dry summer a second growth of fertile fronds may 

 be developed. The following counties are represented. 

 Emmet {P.. /. Cratty, June, 1882) ; Pottawattamie (J. 

 E. Cameron, June, 1897); Webster (July, 1897); Dallas 

 (July, 1897) ; Ringgold (July, 1890) ; Delaware {J. E. 

 Cameron, Sept. 24, 1897, the largest fronds in the collec- 

 tion, in fine fruit); Johnson (July, 1880; June, 1900); 

 Louisa {P. C. Myers, August, 1897, sterile) ; Lee (June, 

 1897). 



