VKRRUCARIEJE. 55 



times almost completely denuded. Perithecimn nearly 

 hemispherical, depressed on the summit, immersed 

 slightly at the base ; nucleus white, enclosed in a brown 

 inner tunic, the colour varying in intensity, sometimes 

 paler, sometimes darker. 



31. V. LUCENS. Ta?/l. Sporidia in asci 8, of an elon- 



gated fusiform shape, 7 -septate, pale yellow. Plate 

 XXIV. lig. 2. 



Vereucaria LUCENS, Taifl Fl. Hib. pi. ii. 257. (183C.) 



Blackwater bridge, Co. Kerry ! Dr. Taylor ^ in herb, 

 Borrer. 



The sporidia separate this from V. plumbea, which it is 

 said to assimilate by the colour of the thallus. 



32. V. MUTABiLis, Borr. MSS. Sporidia 8 in asci, 



oblong, pale, minute. Plate XXIV. fig. 3. 



Lichen aceotellus, Sm. E. Bot. 1712. (1807.) 

 Verrucaria striatula /3. ACROTELLA, Hook. Br. Fl. ii. 155. (]833.) 

 Verrucaria ACROTELLA, Ttti/l. Fl. Hib. pt. ii. 94. (1836.) (exclude 



the Acharian synonym es from all, 

 of which Mr. Borrer has doubts.) 



Sussex ! Mr. Borrer. Wrekin, Shropshire ! Craig 

 Breidden, Montgomeryshire ! 



The peculiar warm-umber hue of the thallus, very dif- 

 ferent when contrasted from the dull-inky-brown of F. 

 umhrina ; the minute, scattered, but very numerous, rounds 

 almost perfectly hemispherical apothecia, not unfrequently 

 polished and shining; and the dimidiate perithecium, 

 enclosing a white nucleus, in a pale scarcely discernible 

 tunic, apparently form the characteristics of this plant. 

 It may be traced, I think, from the scattered apothecia 

 denuded of thallus, published in E. Bot. as acrotella, 

 through states in wliich the thallus is a mere tilm, or oily 

 looking stain, to one in which the thallus becomes nearly 



