217 



Flora Bayerns, Denkschr. k. bay. bot. Gesell. Regens. 4: 

 121. 1861. 

 Cetraria islandica var. rohusta (Branth.) ? see Macoun, 



Canadian Lich. 54. 1902. 

 Cetraria hiascens var. macrophylla Merr., Bryol. 13: 26. 

 1910. 



Type: In the Acharian herbarium, Universitetets Botaniska 

 Institution, Helsingfors, Finland. 



Type LOCALITY : "Helvetia." 



Figure: Merr., Bryol. 13: PL 2.f. i. 1910. 



Original description: "thallo pallido-cinerascente laevigato, 

 laciniis latiusculis planis diffusis irregulariter sublobatis 

 flexuoso-complicatis, marginibus undulatis tenuiter inno- 

 cueque denticulatis." 1. c. 



Diagnosis: Similar to the preceding, laciniae expanded, pale 

 cinereus to pale virescent. 



Description: typical: Thallus subfoliose (max. alt. 10 cm.), 

 subrigid, pale cinereus to virescent; sanguineous below; 

 cortex nitidous, sublacunose, punctate-decorticate; branches 

 bifacial, laciniate (max. width i cm.), subcanaliculatCj 

 margins subspinulose. Apothecia as in the species. 



Contingent phases: Unobserved. 



Substrata: On the earth. 



Distribution: In the Boreal zone or in high (12,000 ft.) 

 alpine situations. 



Observations: This variety represents the most luxuriantly 

 developed condition of the species, and has been seen 

 only from Greenland, Alaska and Colorado. Miss 

 Cummings writes in The Lichens of Alaska that the 

 specimens representing this variety are "a much richer 

 color than the type," but the specimens she refers to I 

 have examined and find they have no characters to cause 

 them to be determined as this variety. I have, however, 

 typical material from St. Lawrence Island, one of the 

 localities named. 



