174 LICHENES. [Lecidea. 



the same colour as the disk — Name ; *#£*£ a small shield, and 

 edos, form ; from the small shield-like appearance of the apo- 

 thecia. — From the Acharian Lecidem those species are here 

 separated which have a distinctly scaly or imbricated thallus : 

 as the genus stands here, it differs then from the following one 

 solely in the nature of the apothecia. — The arrangement of the 

 species is that of Mr. Borrer. 



* Apothecia always black. 



1. L. atrdta, Wahl. ? (inky-crusted Lecidea); crust con- 

 tinuous even minutely tessellated of a greyish rather opaque 

 black its fragments angular slightly concave, apothecia in the 

 interstices half-sunk flattish coal-black with an elevated entire 

 black border. Ach Syn. p. 11. — Lichen atratus, E. Bot. 

 t. 2335 Lecidea coracina, Ach. Syn. p. 11. 



Granite rocks in Glen Esk, Angus-shire.— Mr. Borrer says that the 

 Lichen atratus of E. Bot., though named independently, is perhaps 

 Wahlenberg's plant. 



2. L. atro-cinerea, (ashy-black Lecidea); crust tessellated 

 greyish-black smooth, apothecia several together depressed 

 brownish-black with a pale border at length crowded elevated 

 the border being obliterated. Sm. — Lichen atro-cinereus, Dicks. 

 Cr. Fasc. 3. p. 14. t. 2. f. 2. E. Bot. t. 2096, (excl. the syn- 

 onyms ?). 



On rocks, Mr. Dickson. — This, Mr. Borrer has not noticed in his 

 Ms. list : but I presume it is unintentionally omitted. 



3. L. atro-dlba, Ach. (black and white Lecidea); crust inde- 

 terminate very thin continuous black with grey roughish convex 

 crowded warts, apothecia in the interstices coal-black flattish 

 at length convex with an elevated black border. Sm — Ach. 

 Syn. p. 11. — Lichen atro-albus, Linn. — E. Bot. t. 2336. 



Rocks in the north of England, Mr. Turner. 



4. L. verruculosa, Borr. Mss. (ivhite-warted Lecidea); crust 

 indeterminate very thin fibrous black with white convex crowded 

 smooth warts, apothecia solitary in each wart depressed coal- 

 black with a border of the same colour. Lichen verrucidosus, 

 E. Bot. t. 2317. 



On rocks, Durham, Mr. Winch. 



5. L. fusco-dtra, Ach. (broivnish-black Lecidea); crust grey- 

 ish black thin circular with a fine radiating compound inky bor- 

 der, apothecia sessile flattish coal-black with a thick elevated 

 margin of their own substance and colour. Sm. — Ach. Syn. 

 p, 12. — Lichen dendriticus, Dicks. Or. Fasc. p. 14. E. Bot. 

 t. 1734. 



Rocks and stones, especially flint and quartz. — The Patellaria fusco- 

 atra, Hoffm. (PI. Lich. t. 54. /. I.), Mr. Borrer remarks, is more like 

 L. atro-alba or fumosa. 



