288 Proceedings of the Ohio State Academy of Science. 



15. Fi'lix y\clans. Bladder-fern. 



Delicate ferns with 2-4-pinnate leaves and slender petioles. 

 Sori roundish on the backs of the free veins ; indusimii hood-like 

 and attached by a broad base partly beneath the sorus. {Cys- 

 toptcris) . 



I. Leaves broadest at the base, elongated into a tapering point, bearing 

 brood-buds beneath ; vascular btindles of the petiole oval or 

 flat F . bulhifera. 



1. Leaves scarcely broader at the base, short-pointed, without brood- 

 buds; vascular bundles of the petiole rondish F. fragilis. 



1. Fili.v hnlhi'fcra (L.) Und. Biilbiferous Bladder-fern. 



Ferns with a short rhizome and elongated leaves lanceolate 

 with a broad base, 2-3-pinnatifid or pinnate, the pinnules crowded. 

 Rachis wingless bearing fleshy brood-buds. On moist rocks, 

 especially limestone. General in the state but no specimens from 

 the northwest. 



2. Fiiix fragilis (L.) Und. Fragile Bladder-fern. 



Ferns with a short rhizome and thin oblong-lanceolate, 2- 

 3-pinnatifid or pinnate leaves slightly tapering below ; pin- 

 nae lanceolate-ovate, irregularly pinnatihd. Rachis margined or 

 v/inged, without brood-buds. On rocks and in moist grassy 

 woods and ravines. General. The variety, F. fragiFs iiiaguasora 

 (Clute), is reported from Wayne county by Flopkins. 



16. Woodsia R. Br. 



Small or medituii-sized ferns with 1-2-pinnate or pinnatifid 

 leaves and round sori, with inferior often evanescent indusia, on 

 the backs of the free veins. 



.1. Woodsia obtusa (Spreng.) Torr. Obtuse Woodsia. 



A graceful evergreen fern with a short rhizome and broadly 

 lanceolate, minutely glandular-pubescent leaves without joints in 



