ENDOCARPE/E. 29 



in the double membrane peculiar to this genus. See 

 Plate X. fig. 1. 



3. P. FALL AX, Ifool:. Sporidia in asci 8, about the same 



as in the last, elliptical, pale yellow, with the hya- 

 line double membranous envelope. Plate X. fig. 2. 



Verhucaria fallax, Pers. (fide Ac/i.) 

 Lichen ? hymenius, Jeh. Prod. 80. (1798.) 



Sm. E. Bot. 1731. 



Thelotrema hymenium, Ach. Meth. 133. (]803.) 



T?irn. and Borr. Lich. Brit. 185. 



Pertusaria Wulfenii, L. a El. Er. ed. 3. ii. 320. (1805.) 



_ _ Fries, L. Kef. 424. 



PORINA FALLAX, ^ch. Sjll. 110. (1814.) 



Taj/l. El. Hib. pt. ii. 102. 



Pertusaria fallax. Hook. Br. El. ii. IGO. 



Sussex! Mr. JBorrer. Barmouth ! Oswestry, Shropshire ! 

 Bev. T. Salwey. Spec, exsicc. ! Bolder s Lich. Brit. 



In this the nuclei appear to have become confluent, 

 and spread out into a disk, surrounded by the abrupted 

 margins of the thallodal verruca, in which they were 

 originally imbedded. The asci are very large, and the 

 sporidia more regularly developed, being generally 8 in 

 number, but of the same form, though smaller in size, as 

 in P. communis and its varieties ; the paraphyses are also 

 similar. 



4. P. MELALEUCA. Sporidia in asci 2, about the same 



size as the last, elliptical, pale yellow, with a hyaline 

 double envelope or margin. Plate X, fig. 3. 



Lichen melaleucus, Sm. E. Bot. 2461. (1812.) 



Thelotrema melaleucum. Turn, and Borr. Lich. Brit. 183. (1813.) 



Hook. Br. El. ii. 161. 



Pertusaria communis, d. leioplaca. Fries. L. Ref. 421? (1831.) 



St. Leonard's Forest, Sussex ! Mr. Borrer. 



The sporidia clearly show that this plant does not 

 belong to the genus Thelotrema. 



