VERRUCARIE.E. 57 



Thallus crustaceous, of a greyish-white colour, con- 

 tinuous and crumbly, with minute green dots scattered 

 on the sui-face and throughout its substance. Jpothecia 

 very numerous and crowded, large, prominent, black, 

 when perfect nearly of a true conical shape, the apex 

 perforated and dilated, frequently more hemispherical, 

 more or less rugged and pruinose. Perithecimn dimi- 

 diate, decidedly and conspicuously spreading at the base, 

 not subtending the base of the white nucleus, which is 

 enveloped in a tough black inner tunic. 



35. V. IMMERSA,//<9/'w^. Sporidia in asci 8, linear-oblong, 

 margined, uniseptate, hyaline. Plate XXV. fig. 2. 



Verrucaria immersa, Ilqffm. PI. Licli. t. 12, f. 2-4. (1789.) 



Pers. in Ust. Ann. Bot. st. 7. 



Ta7/l. El. Hib. pt. ii. 90. 

 Verrucaria rtjpestris, Schrad. Spicil. 109, t. ii. f. 7. (1794.) 



Hook. Br. n. ii. 152. 



a. calciseda, Fiies, L. Ref. 436. (in part) (1831.) 



Sussex ! 3fr. Borrer, Craigforda, near Oswestry, 

 Shropshire ! Bev. T. Salwey, Craig-y-rhiw, parish of 

 Oswestry, Shropshire ! 



Mr. Borrer's herbarium contains authentic specimens ! 

 labelled respectively, " V.Schraderi, Schleicher," ''Lecidea 

 lithjrfja, Schleicher," Verrucaria Schraderi var. fqveolata 

 Schgcrer," and " V. Schraderi, Ach., Gemmi, Schaerer." 

 All these on examination and dissection seem to be iden- 

 tical. They have an apothecium which it is very difficult 

 to decide, whether it should most correctly be called 

 entire or dimidiate. I inchne, however, to conclude that 

 its true structure is dimidiate, from the following cir- 

 cumstances, strengthened as they are by a specimen ! in 

 the same herbarium, in all external appearance identical, 

 " sent hy Br. Stvartz to Mr. Turner as Verr. Schraderi'' 

 in which the perithecium is decidedly dimidiate, small 

 and flat, black and carbonaceous, and the inner tunic pale 

 brown. 



