132 Hepaiicae in Northern Alaska. [zoe 



surface cellular projections in the form of irregular and 

 rudimentary ridges, lamellae or spines. These peculiarities 

 indicate an approach to the recently proposed C. asperifolia C. 

 Jensen from Greenland 4 but they are so inconstant and so slightly 

 marked in the Alaskan plants that these should hardly be 

 separated from C divaricata. The writer is led to this con- 

 clusion partly through the examination of Dr. Howe's variety 

 scabra" of this most variable species. In the extreme forms of 

 this Californian variety, the leaves are distinctly spinose on the 

 back, and yet these forms are connected with typical smooth- 

 leaved C. divaricata by intermediate conditions. 



1 6. Blepharostoma trichophyllum (I,.) Dumort. Unalaska 

 (mixed with 1017 and 1038). 



17. Anthelia julacea (L.) Dumort. Unalaska (1029.) 



is. Ptilidium ciuare (D.) Nees. Unalaska (1034, 1037); 

 St. Michael (1800, 1802.) 



19- DiplophylleiataxifoliaCWahl.) Dumort. Unalaska 

 (1038); Cape Nome (mixed with 2500 and 2502). 



20. SeAPANr* undulata (I,.) Dumort. Unalaska (1019 and 

 1020, a large purple form; 1035, a green form.) 



21. Scapania curta (Mart.) Dumort. Unalaska (1016) 

 Immature specimens from St. Michael (1803 and 1804) are also 

 doubtfully referred to this species. 



22. Raduea Bolanderi Gottsche. Unalaska (1025). 



23. Radula COMPIANATA (L.) Dumort. Unalaska (1027). 



since t^eSr'^^^^^^^a^r^ °7 his S1)ecies """enable, 

 note, fro ™ the Madei^ 



1816 Antheha asfie, ,/olta Spruce, On Cephaloziaf 8/1882) J 0t ' 5 277 ' 



5 Mem. Torr. Bot. Club, 7:129. 1899. '' 



Yale University. 



