148 CRTPTOGAMIA. 



Parmelia atra, Ach. Meth. p 154 ; Fr. Lichenogr. p. 141; Lich. Suec. n. 203, 370; 



Montag. Cuba, 1. c. p. 207. 

 Lecanora aira, Ach. Lichenogr. p. 344 ; Syn. p. 146 ; Nyl. Prodr. p. 90. 



Hab. On trees, CarlshofF Island, Paumotu Group. This possesses 

 the spores of L. atra and L. subfusca, and differs from the latter, 

 just as L. atra does, in the disk being black within. The Lichen is 

 perhaps finer than ordinary states of L. atra, upon trunks; the margins 

 of the apothecia being more constantly and regularly crenulate, and 

 the disk quite commonly bespread with a delicate greenish bloom. 



23. THELOTREMA, Ach. 

 Thelotrema lepadinum, Ach. 



Lichen lepadinus, Ach. Prodr. p. 30. 



Thelotrema lepadinum, Ach. Meth. p. 132; Lichenogr. p. 312; Syn. p. 115; Fr. 



Lichenogr. p. 428 ; Lich. Suec. n. 38 ; Turn. & Borr. Lich. Brit. p. 180 ; Nyl. 



Prodr, p. 100. 



Hab. Oregon. 



24. CGENOGONIUM, fflirenb. 

 Ccenogonium Linkii, Ehrerib. 



Ccenogonium Linkii, Ehrenb. in Hor. Phys. Berol. p. 120, t. 27 ; Fee Cryptog. p. 

 138, tab. 2, f. 27 ; Montag. Cuba, 1. c. p. 108 ; Ejusd. Chili, 1. c. p. 211 ; Nyl. 

 Enum. Gen. 1. c. p. 119. 



Hab. Organ Mountains, Brazil. This plant has been removed to 

 the Lecidinei by Dr. Nylander, and, it appears to me, with sufficient 

 reason. 



25. G R A P H I S, Ach. 



Gr aphis script a, [Linn.) Ach. 



Lichen scriptus, L. Fl. Suec. n. 1057, & Auctt. 



Opryrapha scripta, Ach. Meth. p. 30 ; Fr. Lichenogr. p. 370. 



Graphis scripta, Ach. Lichenogr. p. 265 ; Syn. p. 81 ; Nyl. Prodr. p. 149. 



Hab. Tahiti, Society Islands. 



