58 ONOCLEA 



OSTRICH FERN: Onoclea Struthiopteris. 



{Struthiopteris Germanica; Matteuccia Struthiop- 

 teris.) 



Sterile and fertile fronds widely dissimilar; ster- 

 ile fronds 3 to 7 feet high growing in circles, 

 broadest toward the apex, which is abruptly nar- 

 rowed, pinnate ; pinnae long and narrow, cut nearly 

 to the midrib into close, short, slightly-curving 

 lobes ; fertile fronds short, stiff, pinnate, with long, 

 narrow, beaded-edged pinnae, appearing in mid- 

 summer within the circle of the sterile ones. 



Fronds intermediate between the sterile and fer- 

 tile are sometimes produced by the cutting of the 

 early sterile fronds. 



Found in swampy places, and along the borders 

 of streams and ponds, from Newfoundland to Vir- 

 ginia and northwestward. 



NOTES. 



