32 ANGIOCARPOUS LICHENS. 



laginous receptacle (b), which appears loosened from 

 the surrounding thallus. Still deeper, at the bottom of 

 the receptacle, appears the collapsed, rigid, disk-like 

 nucleus {c), gelatinous when moistened, covered with a 

 dark brown layer or veil, and consisting of asci enclosing 

 sporidia and paraphyses intermixed. 



The var. ft. ritpestre. Turn, and Borr., Licit. Brit. 180. 

 Tayl. Fl. Hih. pt. ii.l03. (y. scuTELLiroRME,Ach. L. TJniv. 

 313,) (specimen from Dr. Taylor to Mr. Borrer !)* differs 

 only in the thallus being of a deep yellow or ochrey 

 colour, the receptacle of a darker brown, and the whole 

 apothecium more open and deformed : the sporidiet being 

 alike in both, the only difference being that very few 

 asci appeared developed in this, and that each ascus con- 

 tained only one or two sporidia. (See Plate XII. 

 fig. 2.) 



The form of the sporidia being attended to, it can 

 never be confounded with any state of Parmelia ( Urceo- 

 laria) scruposa. (See Plate XI.) 



2. T. EXANTHEMATicuM, Ach, Sporidia in asci 8, linear- 

 oblong, shghtly tapering towards each rounded ex- 

 tremity, triseptate, pale yellow. Plate XII. fig. 3. 



Lichen exanthematicus, Sm. in Linn. Trans, i. 81. t. 4. f. 1. (1791 ;) 



Sm. E. Bot. 1184; (the magnified fig. admirably characteristic.) 

 VoLVARTA EXANTHEMATicA, D. C. Fl. Fr. ed. 3. ii. 373. (1805.) 

 Thelotrema EXANTHEMATICUM, Ach. L. Univ. 313. (1810;) Syn. 116. 



Hook. Br. Fl. ii. 161. 



ry. Fl. Hib. pt. ii. 103. 

 GtALECTA ? EXANTHEMATICA, FHes, L. Ref. 197. (1831.) 



Sussex Downs ! North of England ! Killarney ! Mr. 

 Borrer. 



In Thelotrema exawikematicum the apothecia in an 

 early state appear at first sight to possess few of the 



* The Rev. T. Salwej has also gathered this variety at Llyn Bodlyn, 

 Merionethshire ! 



