60 ANGIOCARPOUS LICHENS. 



t t I'n^'n.er tunic pale, 



37. V. RUPESTRis, Schrad. Sporidia in asci 8, oblong, 

 margined, pale yellow. Plate XXV. fig. 4. 



Lichen schradeei, Ach. Prodr. 13. (1798.) 



Sm. E. Bot. 1711? 



Verrucaeia schraderi. Ach. Meth. 114. (1803.); L. Univ. 284; 

 Syn. 93. 



Sussex ! Mr, Borrer. 



An authentic specimen ! of *^ V. rupestris, from Dr. 

 Sclirader," in Mr. Borrer's herbarium, presented the fol- 

 lowing characters : Thallus thin, a mere film, very pale 

 olive-brown ; afpothecia prominent, immersed only at the 

 base, hemispherical, with a small depression on the sum- 

 mit, black, scattered ; perithccium dimidiate, more or less 

 spreading at the base ; inner tunic brown, paler or 

 darker ; nucleus brown^ white when wet ; sporidia 

 oblong. 



Mr. Borrer's collection contains an extensive series of 

 specimens, apparently identical with Dr. Schrader's spe- 

 cimen above mentioned, in which some variations are 

 noticeable. 



On flint : the t/iallusw?is of a thicker crustaceous con- 

 sistence, irregularly raised into small warts, or irregular 

 rugged elevations, slightly and irregularly cracked, having 

 altogether a scaly appearance, and investing the very base 

 of the apothecia with a sort of pseudo-thallodal margin or 

 rim, yellowish-brown. Apothecia larger, more numerous 

 and prominent, hemispherical, black. Perithecium dimi- 

 diate, more or less spreading at the base ; inner tunic 

 very thin and delicate, brown, sometimes almost indistin- 

 guishable ; nucleus white j sporidia oblong, pale. 



On sandstone : similar, but the thallus paler in colour, 

 and more crumbly in appearance. 



On chalk : the thallus either cream-coloured and scaly, 

 crustaceous, or of a dirty pale-olive-grey tinge, thin, and 



