30 ANGIOCARPOUS LICHENS. 



5. P. PUSTULATA. Sporidia in asci 2 4, elliptical, 



pale yellow, with the double hyaline membranous 

 envelope. Plate X. fig. 4. 



PoRiNA PUSTULATA. Ach. Licli. Univ. 309. (1810.); Syn. 110. 



Guernsey ! Bev, T, Salicey. 



6. P. HUTCHiNsi^. Only one sporidium in each ascus, 



very large, rotun do-elliptical, pale yellow, with the 

 usual hyaline double envelope or margin. Plate XL 

 fig. 1. 



Thelotrema Hutchinsle, Turn, and Borr. Lich. Brit. 178. (1813.) 

 _ Borr. E. Bot. Suppl. 2G52. 



Hook. Br. Fl. ii. 162. 



Tayl. n. Hib. pt. ii. 103. 



Bantry, Ireland ! Mr, Borrer. 



The form of the sporidium refers this plant also to Pertu- 

 saria. Perfectly distinct from Barmelia (JJrceolaria) 

 scruposa and its variety j3. bri/ophila, as the different spo- 

 ridia manifest. (See Plate XT.) 



Fries, L. Reform, (p. 428) says, " An Barmelia verru- 

 cosa? cujus etiam exstat forma Thelotrema imitans." 

 The sporidia determine this question. 



In Mr. Borrer's herbarium is a specimen ! oiBertusaria^ 

 growing on moss, collected by himself in the Highlands 

 of Scotland, and which, were it not ascertained that 

 lichens alter so much in their appearance, by growling on 

 moss, I should be tempted to consider a distinct species. 

 A single specimen, however, being only at present known, 

 it must suffice to allude to it here, until further search for 

 the plant in its localities may determine its proper po- 

 sition. The plant consists only of a few scattered white 

 scales, growing on moss, from which the verrucse arise 



