summit. Among the earliest of our ferns to fruit. The variety 

 incisa is occasionally found with the type, and differs from it in 

 having the pinna- much incised and in fertile fronds, nearly all 

 of them fruit-bearing. This species is one of our best known 

 ferns and is much used for holiday decorations. {Aspiiliitm 

 acrostic hoides Sw. ) 



CYSTOPTERIS Bernh. 



C. bulbifera (L.) Bernh. Bulb-Bearing Bladder-Fern. Some- 

 what rare. Oxford, Coville. Killawog, N. Y., Clute. Cascade, 

 near Susquehanna, Graves. North of Apalachin, Fen no. Ra- 

 vines at Unadilla Forks, Brown. Elsewhere not reported. 

 Found usually on cliffs. Fronds very long and narrow, prostrate 

 or pendant, bi-pinnate. In addition to fruit dots, the fronds 

 usually bear bulblets on the backs. New plants are formed 

 readily from the latter, and it is probable that this is the fern's 

 principal method of reproduction. 



C. fragilis (L ) Bernh. Fragile Bladder Fern. Brittle Fern. 

 Common in wet, shaded soil, especially on cliffs. Fronds 

 rather slender, nearly a foot long, twice or thrice pinnate. 



ONOCLEA L. 



0. sensibilis L. Sensitive Fern. Very abundant. Found on 

 the borders of ponds and streams and in all low grounds. Ster- 

 ile fronds broad and coarse; fertile fronds later in the season, 

 their segments contracted into berry-like bodies which enclose 

 the fruit. The fertile frond -> remain erect through the win- 

 ter. The so-called variety obtusilobata is occasionally found. 

 In appearance it is half way between the fertile and sterile 

 fronds of this species, and can be produced at will by removing 

 the sterile fronds early in the season. The second or third crop 

 of fronds will take on this shape. 



O.Struthiopteris (L ) Hoffm. Ostrich Fern. Abundant. Found 

 in alluvial soil along our larger streams. Fronds in a circular 

 clump, often twenty or more from the same root, pinnate, the 

 divisions pinnatifid. The fertile fronds appear late in summer 

 from the midst of the sterile ones, much different in appearance. 

 The rootstock sends out long, slender stolons, which form new 



