AND BRITISH AMERICA. iO 



Sect. I. Apothecia superficial, destitute of a thalline margin. 



1. O. varia, Pers., Fr. Crust somewhat leprous, indeterminate 

 (rarely innate in the matrix) ; apothecia superficial, tumid ; margins of 

 the entire exciple at length distant, becoming thin, or disappearing; 

 disk somewhat plane, at first subpruinose, blackish within. Fr. Lichen- 

 ogr. p. 364. O. ajmliformis, Sclutr. ! Spicil. 1, p. 50. — «. pulicaris, 

 Fr. ; apoth. rather elliptical ; disk a little concave, margin inflexed. Fr. 

 1. c. O. vulvella, Ach. — ;?. nolha, Fr. ; apoth. rounded ; disk turges- 

 cent, and often obliterating the margin. Fr. I. c. OpegrapJia, Ach. 

 Graphis curvula, Ehrh. Tuckerm. Lick. N. E. I. c. — y. signata, Fr. ; 

 apoth. elongated ; disk broad, plane, margin evanescent. Fr. ! I. c. 

 Opegrapha, Ach. Lichen hehraicus, Hoffm. 0. cymbiformis, var. he- 

 braica, Schctr. ! Spicil. p. 330, part. — d. diaphora, Fr. ; apoth. elon- 

 gated, both ways rather attenuated ; margin somewhat persistent. Fr. 

 I. c. Opegrapha, Ach. 



Thick bark of oaks and other trees, and degenerant on dead bark- 

 and wood, and stones ; New England. New York (« and (5), Hahey. 

 Pennsylvania (« and /5), Muhl. 



2. O. atra, Pers., Duf. Cr. innate in the matrix ; apoth. emergent- 

 superficial, slender, shining, acute ; margin of the somewhat entire ex- 

 ciple thin ; disk linear", canaliculate, naked, horny within. Fr. Lichen- 

 ogr. p. 366. — a. slenocarpa, Fr. ; apoth. very long, semicylindrical, 

 flexuous; discrete, or reticulate-anastomosing, or maculceform and ir- 

 regular. Fr. I. c. Schar. ! Spicil. p. 48. 0. slenocarpa, denigrata, 

 vulgata, (J* epipasta, a, Ach. — ,3. abhreviata, Fr. ; apoth. abbreviated, 

 irregular, often radiately disposed. Fr. I. c. 0. depressa, ^ 0. epi- 

 pasta, y, 5, Ach. — ;•. viacularis, Fr. ; apoth. dilated into somewhat 

 Tadiate, immarginate maculae, and confluent. Fr. ! I. c. Arthonia as- 

 Iroidea, ^ A. Swartziana, Ach. — d. sidereUa, Fr. ; cr. fuscescent ; 

 apoth. acute^ opake, somewhat innate and here and there erumpent. 

 Fr. I. c. Opegaapha, Ach. O. rufescens, a. rubella, Schter. ! Spicil. 

 p. 50 (e Fr.). 



Smooth bark of trees ; New England. New York (a and y), Halsey. 

 Arctic America (O. epipasta, ;?), Rich. 



3. O. herpelica, Ach., Fr. Cr. innate in the matrix, at length erum- 

 pent, and verruculose ; apoth. emergent, elliptical or obtusely lanceo- 

 late, opake (somewhat ocellate or marginate by the white thalline ver- 

 rucse) ; margins of the entire exciple thin; disk canaliculate, naked. 



