154 LICHENES. 



errucaria. 



and unsatisfactory figure and description given in E. Bot. under the 

 name of Lichen tessellatus, and partly because Acharius had considered 

 the plant as a var. of the Lichen fuscellus of Turn, and E. Bot. t. 1500. 



22. V. murdlis, Aeh. (ivall V errucaria); crust indeterminate 

 composed of thin scattered or confluent scales between pulver- 

 ulent and tartareous pale grey, apothecia prominent nearly 

 globose unpolished umbilicate. Borr. — Ach. Syn. p. 95. Borr. 

 in E. Bot. Suppl. t. 2647. /. 2. — Splmria muralis, Soiv. E. 

 Fungi, t. 295, upper figure. 



Upon walls, chiefly on the mortar. — Allied to V. rupestris; but its scarcely 

 perceptible crust is less continuous and its tubercles not so deeply immersed 

 and less regular in figure, as well as usually larger. Mr. Borrer likewise 

 compares it "to a state of V. viridula when injured by insects; "but the 

 proper state of the surface of that plant is almost always to be traced 

 in some parts of the patch, and its tubercles are larger and more conical. 

 Still the most experienced Lichenists will not, perhaps, be the most 

 forward to decide whether these two productions be truly distinct 

 species." 



23. V. epipolcea, Ach. {large-fruited Rock Verrucarici); crust 

 indeterminate thin tartareous somewhat powdery greyish, apo- 

 thecia large prominent mostly conical brownish-black pruinose. 

 Borr.— Ach. Syn. p. 285. E. Bot. t. 2647./ 3. 



St. Vincent's Rocks, Bristol, Mr. Borrer. North of England, Mr. 

 Brunton, and the Rev. J. Harriman. Wales, Rev. H. Davis. Ireland, 

 Sir Thomas Gage. — This is so nearly allied to V. gemmata of the pre- 

 ceding section, having equally large tubercles, that Mr. Borrer observes 

 it might be supposed a mere " varietas loci ;" yet its more tartareous 

 crust y with a powdery surface, and its rugose, brownish, less variable 

 tubercles afford, perhaps, constantly distinctive marks. Its larger tuber- 

 cles and continuous crust distinguish it from V. mwalis. 



24. V. trachona, Ach. {green Rock Verrucarici); crust inde- 

 terminate thin between pulveraceous and tartareous continuous 

 or slightly cracked greyish-green, apothecia small prominent 

 nearly globose pruinose at length deformed. Ach. Syn. p. 96. 

 Borr. in E. Bot. Suppl. t. 2647./ 1. 



Slaty rocks in different parts of Ireland, Miss Hutchins and Sir T. 

 Gage. — " The general aspect of this Lichen is so much like L,epra- 

 ria botryoidcs, E. Bot., not Ach., (the Chlorococcum vulgare, Grev.) 

 that it might easily be mistaken for that plant, somewhat faded and 

 sprinkled with a minute parasite. Under a glass, however, the crust 

 is found to be thinner and more coherent than that formed by the "pro- 

 pagula" of the Lepraria, and the tubercles seem really to belong to it." 



25. V. maura, Ach. {Black-moor Rock Verrucarid); crust 

 thin continued imperfectly circumscribed coal-black smooth 

 with innumerable minute cracks, apothecia black immersed 

 swelling under the crust and marked by an umbilicated dot. 

 Sm. — Ach. Syn. p. 95 — Lichen maurus, E. Bot. t. 2456. 



Frequent on the Scottish coast, on a reddish porphyritic sandstone, 

 by the sea. First noticed at Dunbar by Mr. Borrer. 



