282 Proceedings of the Ohio State Academy of Science. 



3. Petioles black or dark ])ur])k-; ])iiinac' mostly rather short and 



blunt. 4. 



4. Pinnae auricled at the upper side of the base. 5. 



4. Pinnae not auricled ; alternate or opposite on the rachis, oval or 



roundish oblong, inequilateral A. trichomanes. 



5. Pinnae opposite, oblong; plants small; rachis dark brown or black. 



A. parvulnm. 



5. Pinnae partly alternate usua.lly lanceolate; plants usualh' much 



larger; rachis chestnut brown or reddish A. platyneuron. 



6. Petioles usually green, pinnules fan-shaped, usually incised.... 



A. ruta-niwaria. 



6. Petioles dark at the base, pinnules ovate-oblong, the lowest pinnately 

 cleft into oblong or ovate cut-toothed lobes A. montanuni. 



1. Asplciiiuin f^imiati'fidiiiii Ntitt. Pinnatifid Spleenwort. 



A fern with a short, chaffy, creeping rhizome and pinnatifid 

 or sometimes somewhat pinnate leaves with long tapering points. 

 Evergreen. On rocks. Licking, Fairfield, Hocking, and Law- 

 rence counties. 



2. Asplcninni platyneuron (L.) Oakes. Ebony Spleenwort. 



Rhizome short; leaves linear, 6-i8 inches long, tufted, with 

 purplish-brown shining petioles, and 20-40 pairs of lanceolate 

 or subfalcate pinnae atiricled on the upper side at the base. 

 Evergreen on rocks and banks, especially in limestone soil. Gen- 

 eral except in the northeastern fourth of the state. 



Hybridizes with Caniptosorus rhisophyllns. The form 

 known as Aspleniuni ebenoidcs Scott is probably this hybrid. 

 It is fotmd in Hocking county. 



3. Aspleniuni parvuluni Mart. & Gal. Small Spleenwort. 



A small fern with short, chaffy rhizome and tufted, rather 

 firm, linear-oblong or linear-oblanceolate leaves. Petioles black- 

 ish and shining ; pinnae mostly opposite, oblong, obtuse, some- 

 what auricled on the upper side and nearly sessile. On lime- 

 stone. Southern. In Adams county. 



