162 C. W. Hayes — Expedition through the Yukon District. 



seven are from Taku and four from Prince William sound. The total 

 number of species from Taku is twelve, vi^hile eleven were obtained at 

 Prince William sound. It is thus seen that the percentage of arctic and 

 alpine forms from Taku is considerably the larger. Only one of the 

 lichens is confined to the western coast. 



It is greatly to be regretted that all the valuable collections which Dr 

 Hayes made in the interior had to be abandoned because of lack of means 

 of transjoortation. 



In the determination of these plants I have been indebted for aid to 

 Professor L. M. Underwood, who examined some of the Hepaticx, and to 

 Professor A. B. Seymour, who compared several of the lichens with the 

 collections in the Tuckerman herbarium. 



Wellesley College, April 21, 1892. 



