I2 6 CUMMINGS 



Thallus often many-leaved, lacerate and shaggy underneath. 



muhlenbergii alpina. 

 Thallus of a grayish color. 



Fibrils pale hirsuta. 



Fibrils black cylindrica. 



Thallus without fibrils on the under side. 



Thallus of a grayish color veiled tylorrhiza. 



Thallus blackish-brown. 



Upper surface of thallus smooth, not perforate on the edge. 



anthracina. 



Upper surface of the thallus not smooth, more or less perforate 

 on the edge. 



Thallus smooth underneath hyperborea. 



Thallus ridged underneath erosa. 



1 60. Umbilicaria vellea tylorrhiza Nyl. 



Umbilicaria vellea tylorrhiza NYLANDER, Lich. Lapp. Orient. 122. 1867. 



Alaska, locality lost (Trelease, 1101) ; summit of White Pass (Tre- 

 lease, 1002). Both sterile. New to Alaska. 



The only record we have for this continent is southern Colorado, 

 Brandegee. Nylander records it for eastern Asia and Europe. 



161. Umbilicaria hirsuta (Ach.) Stenh. 



Umbilicaria hirsuta ACHARIUS in Vet Ac. Handl. 1794. /. j, /. /. 1821. 

 Umbilicaria hirsuta STENHAMMER, Sched. Crit. 4 : 1825. DILL. Hist. Muse. /. 

 jo. f. 117. SOWERBY, Eng. Bot. t. 2486. 



Muir Glacier (Trelease, 1006). Sterile. New to Alaska. 



Professor Tuckerman does not give definite notes of its distribution 

 in North America in his Syn. N. A. L. I find no mention of it in 

 Arnold's lists of the lichens of Newfoundland and Labrador. Lind- 

 say does not mention it in his West Greenland Lichens. Branth and 

 Gronlund, in Gronland's Lichen-Flora, recognize the var. papyria, 

 giving three stations for it. In the alpine and arctic regions of Europe 

 it seems to be quite widely distributed. 



162. Umbilicaria muhlenbergii alpina Tuck. 



Umbilicaria muhlenbergii alpina TUCKERMAN, Syn. New Eng. Lich. 74. 1848. 



Locality lost (Trelease, 1004). New to Alaska. 



The variety was described from specimens from "Alpine rocks in 

 the White and Green Mountains, Tuckerman ; and in Hastings county, 

 Canada, Macoun." 



