CETRAR1A. 



151 



In the common form (E. B. 1606) the under surface of 

 the thallus is dark, and the fertile lacinise shortened ; in the 

 variety fallax the former is variegated brown and white, and 

 the latter elongated. (E. B. 2373.) 



A common species, growing on trees, the ground and 

 stones in and about lowland and subalpine woods; it is 

 however very rarely found in fructification. In Scotland it 

 has been discovered fertile near Inverary by Maughan ; we 

 have seen large specimens abundantly fertile from North 

 America. Compared with some other Cetrarias it is not 

 very widely diffused over the globe. It is common in 

 Northern and Central Europe and in Sub-arctic America, 

 and is found as far south as the Alps and the Canary Islands, 

 but not further north than Lapland. 



2. Cetraria juniperina [juniper us, the juniper-tree) is 

 a smaller form, distinguished by its beautiful gamboge-yellow 

 colour ; thallus sinuate-lacerate-lacinulate ; margins usually 

 crisped ; apothecia have a thalline crenulate margin. 



In the common form the thalline margin is naked, and 

 usually denticulate ; in the variety pinastri it is covered 

 with a yellow powder (sorediiferous) and simple. 



An alpine or subalpine species, growing on the ground, 

 on shrubs, and on trees. In Scotland it occurs on the 



