Pteridophyta. 



FILICES. 



POLYPODIUM, L. 



P. VULGARE L. Common Polypody. 



Common on mossy rocks and in rocky woods. Kanawha : 

 near Charleston (Barnes) ; near Coalburg (James). Gilmer: 

 near Glenville (Mapel). Fayette : near Nuttallburg (Nutt- 

 all). Grant: near Bayard and along Buffalo Creek. Mon- 

 ongalia : along Cheat River. Tucker : along Beaver Creek 

 and Blackwater. Randolph: on Rich and Cheat Mountains 

 (Millspaugh) ; near Whitmar (Greenman, 30) ; Greenbrier 

 near White Sulphur Springs. Summers : near Hinton 

 McDowell: near Elkhorn (Millspaugh). 

 P. VULGARE DECEPTUM Maxon, Proc. Nat. Mus., 23:628 (1901). 



Rhizoma slender, extensively creeping, covered thickly 

 with spreading chaff; stipe 5 to 8 inches long, greenish to 

 stramineous ; laminae very dark green above, lighter be- 

 low, 7 to 1 1 inches long, 2.\ to 4 inches broad ; pinnae distant 

 from once to twice their width, broadest in the middle and 

 tapering to an acute apex, the margin doubly crenate or 

 occasionally nearly entire, the base broadly decurrent, veins 

 sinuous and prominent in drying, the veinlets usually fork- 

 ing twice ; tip of lamina long acuminate, as in P. falcatum; 

 sori very large, often irregularly disposed. 



Type in the U. S. National Herbarium, Smithsonian In- 

 stitution, collected by E. L. Morris, No. 1215, on rocks, 

 along the Guyandotte River below Baileysville, Wyoming 

 County, W. Va., alt. 1,100-1,250 feet, August 13-19, 1900. 

 This fern has already been briefly characterized by Dr. 

 Millspaugh as Poly podium vulgare forma biserrata (sic). 

 The name biserratum being already preoccupied by a 

 Mexican fern it becomes necessary, in referring to the 

 West Virginian plant, to substitute a new name. In addi- 

 tion I would refer here Mr. Morris' 1207 collected near 

 the type station ; also Pollard & Maxon's No. 25, collected 

 Aug. 21, 1899, at Quinnimont, W. Va., which I have pre- 

 viously referred tentatively to the variety acutum Moore. 

 From acutum it differs in the narrower and more spatulate 

 pinnae, and commonly in the double crenation, for acutum 

 is normally with entire, or at most slightly serrulate, pinnae. 



