Opegrapha.] LICHENES, 147 



On the smooth bark of trees, Sussex, Mr. Borrer.— The proper bor- 

 der of the lirelLc of this species is very remarkable, having a deep lon- 

 gitudinal furrow, or being, as it were, itself a double border. 



13. O. scripta, Ach. (black-letter Opegrapha); crust thin 

 membranous more or less smooth somewhat shining greyish- 

 white indistinctly bordered with black, apothecia partly immersed 

 naked or pruinose flexuose simple or branched in a parallel di- 

 rection subriraiform surrounded by an accessory raised border 

 formed of the crust. Ach. Lick. Univ. p. 265. Schcer. Licit. 

 Helv. p. 46. n. 87 — 92. (not E. Bot. according to Mr. Borrer, 

 but) O. pulverulenta, E. Bot. t. 1754, O. Cerasi, t. 2301, and O. 

 serpentina, t. 175.5. — Graphis seripta, Ach. Syn. p. 81. — G. ser- 

 pentina, Ach. Syn. p. 83. 



On the smooth bark of trees.— So sportive is this species that it is 

 scarcely possible to define its limits : the crust is more or less smooth 

 and shining, the lirellcc more or less branched, and the disk naked or 

 pruinose. In the type of this species, the a. of Acharius, the Urelbc are 

 naked and shining ; in his £., the O. pulverulent a, Pers. and E. Bot., thc\ 

 are pulverulent, in the y., 0. cerasi E. Bot,, the Urelkc are small and 

 parallel with each other, mostly simple ; and in the O. serpentina of E. 

 Bot. the crust is tartareous and uneven, the lirellcc somewhat powdery, 

 — and all intermediate states of these may be met with : in short, it would 

 appear that almost all the European true Graphides may be referred to 

 one and the same species. 



*** Apothecia with a raised accessory border formed of the crust, 

 the proper border obsolete. Platyguammk. Meyer. 



14. O. Lyellii, Sm. (ivhite-bordcred Opegrapha); crust smooth 

 membranous pale olive, apothecia prominent turgid crowded 

 curved obtuse greyish and powdery destitute of proper bonier 

 with an elevated white powdery accessory border formed of the 

 crust. E. Bot, I. L876, and O. seripta. E. Hot. t. L813, (ac- 

 cording tO Mr. Borrer, but surely very unlike the plant.) — O. 

 marginata, Dubis, Bot. Gall, c 2. p. ()4: } >. — Graphis Lyellu, Ach. 

 Syn. p. < s 5 — Platygramme Lyellii, Meyer in Sprout. — Arthonia 

 marginata, Dufbur. 



On the ru ged lurk of trees, New Forest, Hunts, c. j.udl, Esq. % m 



compliment to wh this most beautiful Lichen was named by SirJ.E. 



Smith. — It lias ven large and prominent ^hir/t/tanon, pulverated and sur- 

 rounded b) the broad and much elevated p rwderj border of the crust. 



15. (). dendritica, Ach. ( Tree-like Opegrapha)} crust tartare- 

 011- determinate very white some* hat powdery, ureUse immersed 

 depressed without any proper border repeatedly branched 

 ligzag tapering at each end. partly covered by the elevated ac- 

 cessory border of the crust. Aeh. Meth, p. 81. /. L./ l«'. 

 /.. Bot, 1. 17 56.-— Graphis dendritica, Aeh, Syn.p, QS.—Platy 

 gramme dendritica, Meyer in Sj>n,i<i. 



Smooth bark of trees, Sussex, Mr. Borrer, New Forest, M< 

 — Tin English Bot. figure of this plant 1- rerj good and chart I 



