(102) 



continent, five others new to the Alaska region, and besides 

 these two or three which have been rarely collected in Amer- 

 ica. With the exception of the collections made by the Har- 

 riman Alaska Expedition in 1899 and reported upon by Dr. 

 Alexander W. Evans,* the number of species — 24 — secured 

 by Mr. Williams is greater than that brought from Alaska f 

 by any other collector. The literature bearing upon the Al- 

 askan Hepaticae has been so fully discussed in the recent 

 paper by Dr. Evans that nothing on that point need now be 

 said. 



Marchantia -polymorfha L. West Dawson, July 30, 



1899. 



Metzgeria -pubescens (Schrank) Raddi. On rocks, Canon 

 City, March 27, 1898. 



Gymnomitriutn coralloides Nees. On rocks, Lake Linde- 

 man, May 5 and 8, 1898. In canon above Lake Lindeman, 

 April 8, 1898. 



Marsupella emarginata (Ehrh.) Dumort. Sheep Camp, 

 March 29, 1898. A variety, also, of this species on rocks 

 above Long Lake, May 24, 1898. 



JVardia scalaris (Schrad.) S. F. Gray. Dawson, Septem- 

 ber 11 and October 2, 1898. Mixed with Lophozia Floerkii. 



Jtmgermannia cordifolia Hook. Abundant in streams 

 running into Lake Lindeman, April 9, 1898. Mixed with 

 Scafania undidata. The leaves are more rigid and the leaf- 

 cells have larger trigones than is normal, but the plants 

 (sterile) agree with J. cordifolia in size, habit, form of 



leaves, etc. 



Lopiiozia Rutiieana (Limpr.). {Jungermannia Ruthcana 

 Limpr. Jahresb. Schles. Gesell. vaterl. Cult. 61 : 207. 1884. 

 Jungermannia lofhocoleoides Lindb. Medd. Soc. Faun, et 

 Fl. Fenn. 14: 66. 1887. Kongl. Sv. Vet.-Akad. Handl. 

 23 6 : 41. 1889.) Paroicous. The species was originally 

 described as dioicous. Lindberg, however, called attention 



*Proc. Wash. Acad. Sci. 2 : 287-314. pi- 16-1S. 10 O. 1900. 



fThe word " Alaska " is employed in the present paper in a geographical 

 rather than political sense. Most of Mr. Williams' specimens came from 

 British soil. 



