GENERA AND SPECIES. | 59 
neighborhood of Big Clifty, Grayson County.* He de- 
scribes the locality as on the banks of Meeting Creek, 
where a huge bowlder of sandstone, thirty-five feet wide at 
the base and thirty feet high, had fallen from the cliff, pre- 
senting a northern exposure perfectly shaded from the sun. 
The fronds were detected, on his return home, among a 
large number of A. pinnatifidum, which he had collected. 
The specimens were fully identified. 
* See Bull. Torr. Bot. Club, vol. vi, p: 123. 
