288 Proceedings of the Ohio State Acadeiiiy of Science. 



15. Fi'lix Adans. Bladcler-fern. 



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

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

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

 toptcris) . 



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

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

 flat F. bulbifcra. 



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

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



1. niix hiilbi'fcva ( L. ) Und. Bulbiferous Bladder-fern. 



Ferns with a short rhizome and elong'ated leaves lanceolate 

 with a broad base, 2-3-pinnatitid or pinnate, the iiiimules crowded. 

 Rachis wingless bearing fleshv brood-buds. ( )n moist rocks, 

 especially limestone. General in the state but no specimens from 

 the northwest. 



2. F Hi. V fragilis ( L. ) Und. h'ragile lUadder-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. fragiF.s niaguasora 

 (Clute), is reported from Wayne countv by Hopkins. 



16. Woodsia R. I'r. 



Small or medium-sized ferns with r-2-pinnate or ])innatifid 

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

 the backs of the free veins. 



I. Woodsia obtiisa (Spreng. ) Torr. Obtuse Woodsia. 



A graceful evergreen fern with a short rhizome and broadly 

 lanceolate, minutely glandular-pubescent leaves without joints in 



