[From ihe Hut.i.EiiN of the Torrby Botanical Club, ^3: S23-334,//. /7-20. 30 Je 1916.] 



Peruvian mosses 



R. S. Williams 

 (with plates 17-20) 



The following list is made up of two collections. The first, 

 obtained by Harry Ward Foote, on the Yale Peruvian Expedition 

 of 191 1, was kindly forwarded by Dr. A. W. Evans of Yale. It 

 consisted of forty-eight packets and contained thirty-seven species 

 among which appear to be two novelties, also two species known 

 before only from Patagonia. The specimens are from localities 

 varying from about 900 to 3,300 meters in altitude. They were 

 without number, and I have accordingly rearranged and numbered 

 them from i to 48. 



The second collection consisted of forty-thr-ee packets, ob- 

 tained by Messrs. Cook and Gilbert, with the exception of three 

 species by Hiram Bingham, while on the Yale University-National 

 Geographic Society Peruvian Expedition in 1915. In this second 

 collection four species are apparently new to science. I may 

 say that it was through the cooperation of the United States 

 Department of Agriculture that Messrs. Cook and Gilbert were 

 detailed to accompany this expedition and the specimens w^ere 

 forwarded to me by Mr. William R. Maxon of the United States 

 National Museum. The altitude at which this second collection 

 was obtained varies from 1,800 to 4,100 meters, and there are 

 thirty-three species not in the first collection, making seventy 

 species in this list. The type specimens of the new species are 

 deposited in the herbarium of the New York Botanical Garden. 



DiCRANUM MiTTENII C. Miill. 



Above Arma Valley, July, 1915, H. Bingham 2o6j. 



I have not been able to find any publication of this species 

 except that by Brotherus in Engler & Prantl's Nat. Pflanzenfam. 

 (i: 328), under subgenus 4. It is a plant of medium size with 

 the ovate leaf-base quickly narrowed to a long, subulate and 

 serrulate point; the alar cells are numerous, those above in the 



323 



