Proceedings of the Ohio State Academy of Science. 283 



4. Asplonium trichomanes L. Maidenhair Spleenwort. 



A small evergreen fern with short, nearly erect, chaffy 

 rhizome and tufted linear leaves. Petioles purplish-brown and 

 shining-, with one vascular bundle in the base ; pinnae oval or 

 roundish-oblong, inequilateral, cuneate at the base, partly alter- 

 nate and partly opposite. Usually on limestone and other rocks. 

 General except in the northwestern fourth of the state. 



5. Aspleiiiuiii angustifdlium Mx. Narrow-leaf Spleenwort. 



Rhizome stout and creeping, rooting throughout. Leaves 

 in a rosette, lanceolate, about 2 feet long, with brownish or green 

 petioles. Pinnae 20-30 pairs, linear-lanceolate. In moist woods. 

 General in Ohio. 



6. AspleiiiiiDi ruta-mnraria L. Rue Spleenwort. 



A delicate fern with short, ascending rhizome and tufted 

 ovate or deltoid-ovate, glabrous, evergreen leaves, Petioles green, 

 naked ; pinnae and pinnules stalked. On limestone. Greene 

 county. 



7. Aspleiiiiiiii montaiiuni Willd. ^lountain Spleenwort. 



Rhizome short and chaffy at the summit. Leaves tufted, 

 evergreen, ovate-lanceolate, acuminate at the apex, 1-2-pinnate, 

 delicate ; petioles slender, naked, blackish at the base. On rocks. 

 Hocking, Fairfield, and Summit counties. (Tuscarawas county, 

 Hopkins.) 



10. Ath'yrium Roth. 



Sori more or less curved, sometimes horseshoe-shaped, often 

 crossing to the outer or lower side of the fruiting veinlet ; veins 

 free. Our species large; leaves usually two feet or more in 

 lengtli. (Aspleninm.) 



1 . Leaves "2-pinnatifid ; segments 1)lunt, scarcely crenatc : vascular 

 l)imdles of petiole 2 /. thrlyf^lcroidcs. 



1. Leaves 2-pinnate, pinnules acute, toothed or pinnatifid. \ascular 

 bundles 2 /. fili.v-fociniiia. 



