THE FERN BULLETIN 



Vol. XVIII OCTOEER, 1910 No. 4 



TWO NEW POLYPODIES FROM ARIZONA. 



By Willard X. Clute. 

 While collecting in the mountains north of Tucson, 

 Arizona, in the autumn of 1910, Mr. James H. Ferriss 

 discovered two colonies of a peculiar fern, specimens of 

 which are illustrated in this number of the Fern Bulle- 

 tin. The fern is unmistakably a polypody and not 

 distantly related to P. vulgare, but it needs but a glance 

 at the illustration to show that it is not to be referred 

 to this species. Xot only are the fronds smaller and 

 slenderer with more pointed pinnae, but they are very 

 thin in texture, barely half as thick as the fronds of P 

 vulgare. Being convinced of its distinctness I here- 

 with name it 



POLYPODIUM PR0L0XGIL0BUM X. Sp. 



Fronds under six inches high from a creeping scaly 

 root^tock ; blade thin, inclining to oblanceolate. three 

 inches or more long, one-third to half as wide, cut 

 nearly to the midrib into from six to ten pairs of alter- 

 nate pinnae ; lower pinnules, short, narrowed at base, 

 wider in the middle and round ended, those above end- 

 ing in a long accuminate tip: apex of the frond long 

 and slender often forming a third of the blade; sori 

 in a double row about mid-way between margin and 

 midrid : veins once or twice forked. 



Collected by Tames H. Ferriss on rocks on the 

 «— southern slopes of Mt. Lemmon. in the Santa Catalina 

 °0 Mountains. Arizona, October 1910. Type specimens 

 ^ in the author's herbarium. 



