OP ARTS AND SCIENCES. 403 



tato ; apotheciis minutis adnatis, disco piano fusco-nigro opaco subraar- 

 ginato marginem thallinum integrum demum subcoloratum fBquante. 

 Sporce octonte, incolores, ellipsoideos, polari-diblastte, diam. 2-plo longi- 

 ores. On trees, Western Florida, Mr. Beaumont. On bushes, thick- 

 ets of the Blanco, Texas, 3Ir. Wright. Thallus thin and smooth, be- 

 coming ash-colored, limited more or less by the blackening hypothal- 

 lus. Apothecia small and closely sessile, lecanorine ; the flat, nearly 

 black, opaque disk scarcely or indistinctly marginate ; but the rather 

 thickish and entire thalline exciple at length more or less colored. A 

 small lichen with much of the aspect of some states of L. sophodes, but 

 the spores of the present section. 



Lecanora camptidia, sp. nov. : thallo crustaceo tenui inaequabili 

 dein rimuloso cinereo-fuscescente hypothallo nigro sublimitato ; apo- 

 theciis mediocribus biatorinis sessilibus, disco plano-convexo rufo-fusco 

 albo-pruinoso marginem integrum albidum mox flexuosum fuscescen- 

 tem demum superante ; excipulo thallino excluso. Sporae octonse, in- 

 colores, elhpsoideas vel oblongo-ellipspidejs, diam. 2 - 3-plo longiores. 

 On various trees, and on rails, in Southern Pennsylvania, Maryland, 

 and throughout Virginia (Alexandria, near Richmond, and in Sussex 

 County), where it becomes common. North Carolina, Rev. Dr. Curtis. 

 South Carolina, 3Ir. Ravenel. Texas, Mr. Wright. Thallus thin, 

 smooth, becoming chinky and at length much broken, and more or 

 less brownish-ash-colored ; the hypothallus, which sometimes appears 

 as a white fringe, at length blackening, and in that way conditioning 

 the thallus, which it sometimes decussates, Apothecia of middling 

 size, biatorine, sessile, the smooth and entire, at first nearly white, but 

 soon fuscescent and flexuous margin, at length exceeded by the plano- 

 convex reddish-brown disk, which is besprinkled with a white, fuga- 

 cious bloom ; the thalline exciple for the most part quite obsolete, but 

 sometimes obscurely recognizable as a depressed crenulate border ; or 

 much more rarely (as in L. ferruginea) conspicuous, when the apo- 

 thecium becomes zeorine, or lecanorine, according as the proper mar- 

 gin is more or less evident. The lichen is thus (like L. ferruginea) now, 

 in its lecanorine state, a Callopisma of Koerber ; and now, in its leci- 

 deine condition, a Blastema. In its more perfect states this species is 

 sufficiently distinct-looking ; but small forms are not unlike Lecidea 

 spadicea, Ach., and large ones may sometimes be passed over for Leca- 

 nora subfusca. 



Lecanora Berica. Maronea Berica, Massal. in Flora, 1856, n. 



