VERRUCARIEiE. 45 



Thallus thin, tartareous, mouse-coloured. Apothecia 

 large, prominent, one half above the thallus, the other 

 half immersed in a minute cavity of the rock, dark brown. 

 Perithecium in section having somewhat of a broad de- 

 pressed ampuUaeform shape, very thick and stout, nucleus 

 w^hite. 



This Dr. Taylor named " V. Harrimanniy Ach. ?" but 

 it is certainly not the E. Bot. plant, which, as Mr. Borrer 

 informs me, came, like Acharius's specimen, from Mr. 

 Harrimann himself. The authentic morsel ! in herb. 

 Borrer, from Mr. Harrimann is a much more minute 

 plant, having the thallus indeed of a somewhat similar 

 colour, but the perithecium is flat and dimidiate, the pale 

 yellow nucleus without any visible tunic entirely sunk in 

 the rock. Not a trace of asci nor sporidia discoverable. 

 (See Plate XIX. fig. 4.) 



14. V. PLUMBEA, Ach. Sporidia in asci 8, elliptical, mar- 

 gined, pale yellow. Plate XIX. fig. 5. 



Verrucakia pltjmbea, Ach. L. Univ. 285. (1810) ; Syn. 93. 



_ Fries, L. Ref. 438. 



_ _- Booh Br. n. ii. 153. 



Ta^l. El. Hib. pt. ii. 91. 



Lichen plumbostjs, Sm. E. Bot. 2540. (1813.) 



Near Middleton in Teesdale ! Bev. J. Harrimann, 

 in herb. Borrer. Craig-y-Rhiw, parish of Oswestry, 

 Shropshire ! 



The square-shaped section of the perithecium is remark- 

 able ; nucleus white. 



A specimen ! among the collection of Mr. Harrimann's 

 Lichens, in herb. Borrer, which from its accordance with 

 Acharius's description, Mr. Borrer supposed might be 

 V.glaucinay Ach., seemed to me identical with V.plumbea. 



