208 HERRE 



plants on trees: pale sage-green, varying to colors as dark as those 

 of earth-growing forms; beneath black, fading into pale brown, 

 with broad white margins. 



Rarely found in fruit anywhere, and always sterile with us. 



Everywhere on trees in the mountains above 1500 feet, but at no 

 place very abundant; usually on the limbs of Pseudotsuga taxifolia. 

 This lichen also occurs on earth in rock crevices at slight ele- 

 vations near the sea coast. 



On sandstone in Devils Canon, altitude 2300 feet, occurs the variety 

 fusca (Flot.), which differs from the type in having the entire 

 thallus of a dark olive brown. Rare and local. 



A widespread lichen of the north temperate and sub-arctic regions. 



5. CETRARIA TUCKERMANI Herre. 



Cetraria glauca stenophylla Tuck. Syn. N. Am. Lich. I: 36. 1882. 



name preoccupied. 

 Cetraria tuckermani Herre, Proc. Wash. Acad. Sci. 7 : 340. 1906. 



This species differs from Cetraria glauca in having the lobes elon- 

 gated, lax, narrow or linear, and more or less channelled; margin 

 irregularly cut and erose; beneath black or dark brown at the base, 

 the lobes white beneath. Sterile with us. 



On bark of coniferae near King's Mountain House, altitude 1900 

 feet, and in the Big Basin, at an altitude of about 1200 feet. 



Widely distributed but not abundant anywhere. 



In the Tuckerman Herbarium are specimens labelled "Santa 

 Cruz Mountains," collected by Dr. W. G. Farlow; on Pinus con- 

 torta, Tomales Bay, collected by H. N. Bolander, and from Monterey 

 County, collected by Mrs. M. A. Booth. The plant is also recorded 

 by Tuckerman from Oregon. In the herbarium of the University 

 of California is a specimen from Eureka; probably generally dis- 

 tributed from central California northward to the western part 

 of Washington. 



Named for our most eminent student of lichens, Edward Tuck- 

 erman. 



6. CETRARIA LACUNOSA STENOPHYLLA Tuck. 



Cetraria lacunosa stenophylla Tuck. Syn. N. Am. Lich. I: 35. 1882. 

 Cetraria lacunosa stenophylla Herre, Proc. Wash. Acad. Sci. 7: 339. 

 1906. 



