ENDOCARPE.E. 23 



3. S. viRiDULA, Fries. Sporidia in asci 8, very large, 



broadly elliptical, granulated. Plate VII. fig. 3. 



Lichen placothallus, Ach. Prod. 18. (1798.) 

 Endocarpon viridulum, Schrad. Spicil. El. Germ. 192. (1794.) 

 Lichen tessellatus, Sm. E. Bot. 533. (bad.) (1798.) 

 Verrucaria ruscELLA, ^. VIRIDULA, AcL L. Univ. 289. (1810.) 

 Verrucaria VIRIDULA, Ach. L. Univ. 675. (1810.) 



Borr. E. Bot. Suppl. after t. 2623, fig. 2. 



Hook. Br. El. ii. 153. 



Sagedia VIRIDULA, FHes, L. Reform. 414. (1831.) 



Sussex ! Mr. Borrer. 



The apothecium, which is membranaceous, thin, and 

 black, has its apex surmounted by a thickened and car- 

 bonaceous distinct substance, precisely similar to the 

 di\midi\dXQ peiitheciiim of many species of Verrucaria. The 

 sporidia have a peculiarly dotted or granulate appearance 

 from the internal granules, which prevents its being con- 

 fused with S. ochrostoma. The thallus is, in general 

 appearance and habit, similar to that of an Endocarpon, 

 whilst the apothecia are those of a Verrucaria, except that 

 they are imbedded in the thallus. 



4. S. OCHROSTOMA, Borr. MS. Sporidia in asci 8, 



elliptical, margined, pale. Plate VII. fig. 4. 



On plastered walls, Sussex ! Mr. Borrer. 



Thallus moderately thick, crustaceous, verrucoso-nigose, 

 coarsely cracked into areolae, varying in colour from a 

 dusky cream or grey, through an olive, to a brownish- 

 black or umber, with a rather thick bright green stratum 

 immediately underneath the surface. Ajjothecia numerous, 

 minute, entirely immersed in the thallus, the slightly raised 

 hemispherico-conoid black apex only visible, perforated 

 with a simple pore. Tu7iic thin, black, entire ; nucleus 

 pale. 



