50 ANGIOCARPOUS LICHENS. 



B. Perithecium dimidiate. 



* Perithecium incurved at the base. 

 t Inner tunic black. 



23. V. TRACHONA, Taylor, Sporidia in asci 8, fusiform, 

 triseptate, pale yellow. Plate XXII. fig. 1. 



Veeeucaeia TRACHONA, Tayl. n. Hib. pt. ii. 93. (1836.) excl. syn. 



Derriquin, Co. Kerry ! Br. Taylor iii herb. Borrer, 



The perithecium of this plant is described in Fl. Hib. 

 as subtending the base of the nucleus. This at first 

 sight is difficult to determine on account of the dark 

 colour of the perithecium, the inner tunic and the nucleus, 

 when dry ; but careful observation will, I believe, prove 

 that the perithecium is not entire, the dark nucleus (white 

 when moistened) being enveloped in a very tough, thick, 

 black tunic. 



The variety " on rocks in Askew wood, " (original spe- 

 cimen ! from Dr. Taylor, in herb. Borrer,) does not differ 

 in the apothecia and sporidia. (See Plate XXII. fig. 2.) 



The section of the apothecium and the form of the 

 sporidia keep this abundantly distinct from V, epiycea 

 and elceina or Byrenothea leiicocephala, whilst the presence 

 of the apothecia prevents its confusion with a Lepraria. 



Mr. Borrer {in lit. 1850) says, "not V. trachona, E. 

 Bot. Suppl. which I suppose to be Acharius's, and like 

 V. lithina, Tayl." (the Byrenothea lithina of this work.) 



24. V. coNCiNNA, Borr. Sporidia in asci 8, oblong, mar- 



gined, pale. Plate XXII. fig. 3. 



Verrucaeia CONCINNA, Borr. E. Bot. Suppl. 2623, fig. 1. (1830.) 

 iToo/t. Br. Fl. ii. 152. 



Ireland ; Teesdale ; and Sussex Downs ! Mr. Borrer, 

 On Maze Beck, Westmoreland ! Mr. W, Robertson, in 

 herb. Borrer. 



