ENDOCARPE^. 31 



singly and separately, of a tawny flesh-colour, the apex 

 somewhat depressed, the orifice still more depressed, 

 brown ; nucleus pale-yellow, or brownish in the lower 

 portion, hyaline above, surrounded by a pale-coloured 

 membranous tunic ; sporidia in asci 4, of about the same 

 size as in P. fallax, elliptical, pale yellow, with a hyaline 

 double envelope or margin. (See Plate XI. fig. 2.) 



Genm 5. Thelotrema, Ach, 



Apothecium verrucaeform, formed of the thallus, at first 

 closed, afterwards margined with the open apex, enclosing 

 a deeply sunken nucleus, ultimately collapsed into a de- 

 pressed rigid disk, enveloped in a distinct membra- 

 naceous receptacle, lacero- dehiscent at the apex. Thallus 

 crustaceo-cartilaginous. 



1. T. LEPADiNUM, Ach. Sporidia in asci 8, fusiform, 

 filled with granules, arranged in numerous horizontal 

 series, giving them a peculiar gemmate appearance, 

 pale-yellow. Plate XII. fig. 1. 



Lichen ? lepadintjs, Ach. Prod. 30. (1798.) 

 Lichen inclusus, Sm. E. Bot. 678. (1800.) 



Thelotkema LEPAiiiNUM, ^c/^. Meth. 322. (1803;) L. Univ. 312; 



Syn. 115. 



Turn, and Borr. Lich. Brit. 180. 



Fries, L. Bef. 428. 



Hook. Br. Fl. ii. 161. 



Tayl. n. Hib. ii. 102. 



Sussex ! Mr, Borrer, Cors-y-gedol ! Bev. T. Salwey. 

 King's Wood, Roche Abbey, Yorkshire 1 Bolder s Lich, 

 Brit. 



In this the typical species of this genus, the thallodal 

 wart {a) is, as it were, excavated, the apex having a large 

 roundish aperture, at some depth within which is seen 

 the irregularly lacerated opening of the tough sub-carti- 



