68 ANGIOCARPOUS LICHENS. 



6. P. LiTHiNA. Sporidia not contained in asci, free, in- 

 numerable, very minute, linear-oblong, rounded at 

 each extremity, yellow. Plate XXIX. fig. 3. 



Verkucaria trachona, Ach. Meth. Suppl. 16. (1803 ;) L. Univ. 286 ; 

 Syn. 96. 

 Borr. E. Bot. Suppl. 2647, fig. 1. 



Verrucaria LITHINA, Ta^l^ Fl. Hib. pt. ii. 92. {excl. sj/n.) 



Derriquin, Co. Kerry ! Dr. Taylor, in herb. Borrer. 

 and Salwey. 



This is not identical with the true Verrucaria litldna, 

 Ach., of which there is an authentic specimen from 

 Swartz, in Mr. Borrer's herbarium ! It has the peri- 

 thecium dimidiate, and only two sporidia in each ascus, 

 very large, oblong, triseptate, and consequently referable 

 to the tartareous section of the genus Endocarpon, 



In 1849, I collected in the "great gulley,'' on Craig 

 Breidden, Montgomeryshire, specimens which had apo- 

 thecia and sporidia identical with those of F, lithina, but 

 the thallus was much less compact and more crumbly, 

 than in Dr. Taylor's specimens, and of a green colour. 



6. P. LUTE A, nov. sp. Sporidia not in asci, free, curved, 

 of a linear shape, finely tapered at each extremity, 

 pale-yeUow. Plate XXIX. fig. 4. 



On bark of trees, Gopsal, Leicestershire ! Bev. A, 

 Bloxaiiu 



Thallus compact, smooth, yellow, cracked into minute 

 areolae, the cracks disclosing a pale brown substratum 

 underneath. Apothecia very numerous and crowded, 

 generally one in each areola, dark-brown, hemispherical, 

 depressed. Perithecium dimidiate, thick and clumsy. 

 Nucleus white, when moistened. 



Intermixed with this, grew Opegrapha ? in 



which the sporidia were in asci, 8, fusiform, 4 -septate. 



