74 CUMMINGS 



Dr. Nylander records it as growing on earth and moss on St. Law- 

 rence Island ; Dr. Rothrock and J. M. Macoun record its occurrence, 

 but give no localities. The specimen from St. Matthew Island is 

 fruited, the others are sterile. 



The genus Siphula was not found among the Harriman collections, 

 but Siphula dactyliza Nyl. and S. ceratites (Wahl.) Tr. are re- 

 ported by Dr. Nylander as growing on quartz rock on St. Lawrence 

 Island, the latter species also on moss associated with Lecidea subal- 

 linita Nyl. In Tuckerman's Genera Lichenum S. ceratites is cred- 

 ited to Bering Strait (Mr. Wright) , the only American locality given 



for it. 



Family ARTHONIACEJB. 



ARTHONIA. 



9. Arthonia punctiformis Ach. 



Arthonia punctiformis ACHARIUS, L. U. 141. 1810. 



Sitka (Trelease, 839). New to Alaska. 



Growing on Alnus oregana. Spores 2-3 4-septate. Thallus not 

 uniform, and thus varying from most of the specimens in the Tucker- 

 man Herbarium. A widely distributed species. 



Arthonia mediella alnicola Nyl. is reported by Dr. Nylander as 

 having been collected on branches at Port Clarence. 



Family OPEGRAPHIACE^). 

 GRAPHIS. 



10. Graphis scripta (L.) Ach. 



Lichen scriptus LINN^US, Spec. PI. ed. 2. 2 : 1606. 1764. 



Graphis scripta ACHARIUS, L. U. 265. 1810. SOWERBY, Eng. Bot. t.iSij. 



Orca (Trelease, 1801). New to Alaska. 



Growing on the bark of dead coniferous trees. Reported from 

 Newfoundland by Arnold, but I find no record of its occurrence in 

 Greenland. 



No. 811, collected at Sitka by Trelease, is evidently a Gr -aphis. 

 Unfortunately the spores are not developed, and therefore it is impos- 

 sible to place it. Apparently it belongs in the section Fissurina, 

 which is characteristically tropical. 



XYLOGRAPHA. 



1 1 . Xylographa opegraphella Nyl. 



Xylographa opegraphella NYLANDER, Enum. Lich. 128. 1857. 



Alaska (Trelease, number lost). On dead wood with Lecidea 

 enter oleuca and Placodium ferrugineum. 



