LIMBORIEiE. 65 



think this the normal state ; although the greater number 

 of them have apparently 5 septa as at (c), but it is 

 doubtful whether the appearance of additional septa does 

 not arise from a collapse of the contents. 



The form of the perithecium here still more closely 

 approaches that characteristic of Sagedia. 



Tribe IV. LIMBORIE^, Fnes, 



Apothecium round; proper receptacle carbonaceous, 

 closed, ultimately dehiscing variously ; nucleus somewhat 

 waxy, becoming rigid. Thallus crustaceous. 



Genus L Pyrenothea, Fries. 



Perithecium round, carbonaceous, closed, perforated 

 with a simple opening, protruding a globular nucleus, 

 which at length falls to pieces, ultimately dehiscent, 

 spread out, evacuated. Thallus crustaceous. 



The great feature in this genus is, that the sporidia 

 are free, and not contained in asci, but are conglomerated 

 together, as in many fungi, and fall to pieces or dissolve 

 on the application of moisture, frequently issuing from 

 the perithecium in a continuous stream or cloud. 



1. P. LEUCOCEPHALA, Fries. Sporidia not contained in 

 asci, free, innumerable, of an irregular, gibbous, 

 linear-oblong form, pale yellow. Plate XXVIII. 

 fig. 1. 



Veerucaria LEUCOCEPHALA, Ach. Mcth. 116. (1803 ;) L. Univ. 286. 



Borr. E. Bot. Suppl. 2642, fig. 2. 



^oo/t. Br.Pl. ii. 152. 



Tayl. Fl. Hib. pt. ii. 90. 

 Pyrenula LEUCOCEPHALA, Ach. Syn. 126. (1814.) 



Cyphelium LEUCOCEPHALA, Ach., in Stockholm Trans. (1817.) 226, 



t. 8. f. 7. 

 Pyrenothea leucocephala, Fries, L. Ilef. 450. (1831.) 



5 



