120 
BEAUTIFUL FERNS. 
272. — Hooker & Baker, Syn. Fil., p. 147. — Fournier, PI. 
Mex., Crypt., p. 119. — Williamson, Ferns of Kentucky, p. 
52, t. 12. 
Ptcris atropurpurea, Linn^us, Sp. PI., p. 1534. — Michaux, FI. Bor. -Am., 
ii., p. 261. — Swartz, Syn. Fil., p. 106. — Schkuhr, Krypt. Gew., 
p. 93, t. lOI. WiLLDENOW, sp. PI., V., p. 375. PuRSH, FI. 
Am. Sept., ii., p. 668. 
Platyloma atropurpuremn, J. Smith. — Torrey, FI. New York, ii., p. 488. 
Allosorus atropurpurcus, Kunze, in Sill. Journ., July, 1848, p. 86 ; Lin- 
naea, xxiii., p. 218. — Gray, Manual, ed. ii., p. 591. — Mettenius, 
Fil. Hort. Lips., p. 44. 
PellcBa mucronata. Fee, 9 me Mem., p. 8. 
Pellcea glabella, Mettenius & Kuhn, in Linnaea, xxxvi., p. 87. 
Pleris spiculata, Schkuhr, Krypt. Gew., p. 92, t. 100. 
Ptcris Adianti facie, caule ramulis petiolisque politiore iiitore nigrican- 
tibus, etc., Gronovius, FI. Virginica, ed. i., p. 197. 
Hab. — Crevices of shaded calcareous rocks ; from Canada to the 
Rocky Mountains of British America, and southward to Alabama, Ar- 
kansas, Indian Territory and Arizona. It has been found in several 
parts of Mexico, and even in South America (“Andes of Mecoya, 
Pearce,” according to Synopsis Filicum'). It was collected by John 
Clayton about 1736, “on the shore of the river Rappahannock in a 
shady place by the root of a juniper near the promontory called Point 
Lookout,” and I take pleasure in giving it an English name in his 
honor. 
Description : — The root-stock of this fern is rather 
short, usually somewhat nodose, and densely chaffy with very 
