114 American Fern Journal 



of the southwest usually known as Pellaea W right i ana 

 Hook., but which, as Christensen has shown, must be 

 called Pellaea mucronata Eaton, the name mucronata 

 having a priority of two years. Few fern species of 

 the United States show a wider range of variation than 

 this. 



Among the other interesting ferns of Professor Good- 

 ding's collection are the following: 



Polypodium hesperium Maxon. The specimens are 

 from Fort Grant, Arizona, under ledges, June 15, 1912, 

 Goodding 1046. They agree well with the few Arizona 

 specimens known and are evidently only a minor variant 

 of this common species of the western United States. 

 The Arizona plant described recently as a new species, 

 Polypodium prolongilobum, by Mr. Clute, 1 appears to be 

 a nearly sterile thin -leaved form of this species. 



Polypodium thysanolepis A. Br. This is repre- 

 sented by specimens from Ramsey Canyon, Huachuca 

 Mountains, Arizona, collected August 23, L910, Goodding 

 761. It seems to be known in the United States only 

 from the Huachuca Mountains. The specimens are 

 not very large but otherwise they are perfectly typical 

 of the species as it exists from Mexico to the Andes of 

 South America and in Jamaica. There are many related 

 species in tropical America, whose limits are not clearly 

 understood. These will be treated in a paper soon to be 

 published by the writer. 



Dryopteris Dryopteris (L.) Britton. Excellent 

 specimens of this species were collected in dense shade 

 upon steep slopes, Bonita Creek, in the White Moun- 

 tains of central-eastern Arizona, July 23, 1912, Goodding 

 1222. These constitute a notable extension of range, 

 the species having been known heretofore to extend no 

 farther south than Colorado. This species, commonly 



■Fern Bull. 18: 97. 1910. 



