144 LICHENES. [Opegraphd. 



them as a section, only, of Opegrapha, with which they perfectly 

 agree in appearance. " The accessory border to the lirellce, more 

 or less complete in different species, is but an unsatisfactory 

 distinction, and the other characters assigned by the great 

 Swedish Lichenist, are, if constant, too minute for general use." 

 Borr. 



* Apothecia destitute of an accessory border. (OpegrapHjE vera?.) 



1. O. hjncea, Borr. Mss. {grey speckled Opegrapha); crust 

 white subtartareous even uniform, apothecia numerous de- 

 pressed oblong curved rounded at each end somewhat im- 

 mersed csesio-pruinose with a black border Arthoma lyncea, 



Ac/i. Syn. p. 7. — Lecidea lyncea, Ach. Meth Lichen lynceus, 



E. Bot. t. 809. — Opegraphd notha, 7 . cassia, Ach. Syn. p. 76. 

 (Borr.) 



On the rugged bark of Oak.— This forms patches of considerable 

 extent, spotted with the numerous oblong curved apothecia, whose 

 rather broad disk is pruinose while the slightly raised border is black. 



2. O. epipdsta, Ach. (smooth dotted Opegrapha); crust very 

 thin irregularly circumscribed smooth shining varying from 

 grey to pale copper-colour, apothecia innate minute scattered 

 somewhat parallel slightly convex oblong or roundish mostly 

 simple with a narrow black edge. Ach. Syn. p. 74. E. Bot. 

 t. 1 828 ? (Borr.) — (3. microscopica ; crust coppery glossy, apo- 

 thecia not unfrequently branched. Ach O. microscopica, E. 



Bot. t. 1911. — Graphis microscopica, E/irh. 



On the smooth bark of trees, especially of young oaks.— This is 

 remarkable for its very thin smooth crust, and the minute dots of 

 fructification. 



3. O. rubella, Pers. (reddish Opegrapha); crust continued 

 limited reddish ash-coloured slightly rugged, apothecia short 

 rounded somewhat curved their disk broader than the border. 

 Pers. in Vst. Ann. fasc. 7. p. SI. t. 1. /. 2. A. a. E. Bot. 

 t. 2347.— O. herpetica, (3. Ach. Syn. p>. 72.— Lichen rubellus, 

 Ach. Prodr. p. 22. 



On the trunks of large trees ; communicated by Mr. D. Turner, to 

 Engl. Bot. — Crust of a reddish smoky hue. Apothecia like dots, numerous, 

 short, rounded-oblong, almost all separate, their disk black, flattened, 

 at least as broad as the margins, frequently broader. 



4. O. rufescens, Pers. (rusty Opegrapha); crust cartilagineo- 

 membranaceous pale ferruginous, apothecia innate variously 

 shaped flexuose simple branched and substellated, the disk 

 grooved nearly plane. (Ach.) Pers. in Vst. Ann. fasc. 7. p. 29. 

 t. 2. / 3. A. a,— O. siderella, Ach. Syn. p. 79.— O. phcea? 

 Ach. Syn. p. 78. — 0. herpetica, Ach. ? E. Bot. t. 1 789. 



On the bark of trees, Mr. Borrer, who suspects that O. herpetica, 

 Ach. and E. Bot, belongs rather to this than O. rubella, and who is by 

 no means certain that the different crust and the lirellce more sheathed 

 by it (" innate") constantly distinguish O. rufescens from 0. aba. 



