284 



POPULAR HISTORY OF LICHENS. 



margins crisped ; extremities cut. Apothecia superficial and 

 marginal, largish, brown. The laciniee may be concave or 

 canaliculate ; they are sometimes lacerate-pinnatifid or their 

 margin is entire. 



On rocks or stones in various parts of the Highlands. 

 Its spermogones are immersed, but indicate their presence 

 by small dark points on the surface of the thallus (as ob- 

 served in var. Jacob afolium^ which is distinguished by lace- 

 rate-pinnatifid lacinise) ; but they are apt to be cod founded 

 with a parasitic SpAaria, whose perithecia are sometimes 

 similarly immersed. The paraphyses of the same variety 

 adhere intimately by their apices, which are much dilated ; 

 this is also noticed in other species of Collema. 



7. Collema Burgesii. Thallus laciniate-lobate, loosely 

 adnate, lead-coloured, smoothish, — below slightly tomentose. 

 Lobes imbricate, minutely dentate-lacerate. Apothecia de- 

 pressed, concave, large, brown, with an elevated lacerate- 

 dentate or foliose margin. (E. B. 300.) 



So named from having been first discovered by Dr. Bur- 

 gess on the hazel and birch in Dumfriesshire. It occurs on 

 trees in various parts of the Highlands, as about Loch Lo- 

 mond, Inverary, and Glencoe. Its spores resemble those of 

 TJrceolaria scruposa ; the contained cellules are arranged in 



