14, ASPLENIUM Diosc. 
Lhe name ‘‘Asplenon™ appears to have been applied 
by the ancients to Asplenium ceterach. The other spe- 
cles were known under various names, as Adiantum- 
nigrum, Lonchitis, Phyllitis, Ruta-muraria, Tricho- 
manes Ec. . 
Mostly rock-loving plants. Leavesvarious. Sori lin- 
ear, situated along the free veinlet. 
} Leaves pinnatifid, sometimes pinnate. 
* Lobes usually rounded. 
1. A. pinnatifidum Nutt. Pls. 
Asplenium pinnatifidum Nutt. 1818. Gen. 2:251. 
flaton, Ferns N. Am. 1: 61. t. 8. f. 2; in Gray 
Man. 683. Underw. in Ill. Fl. 1: 22; Nat. Ferns 
103; in Britt. Man. 11. Clute, Ferns 167. Waters 
Ferns 130. 
SPLEENWORT. 
Low plants with the habit of Campfosorus rhizophyl- 
Zus; leaves lanceolate, 6 cm. or longer, apex attenuate, 
lobes unequal, usually rounded; sori irregular. 
In crevices of rocks, April-July. 
Collected in several localities in Pennsylvania, West 
Virginia and Tennessee, but apparently rare in our reg- 
ion. 
