OF ARTS AND SCIENCES: APRIL 12, 1864. 268 



Observationes LiCHENOLOGiCiE. Observations on North Ameri- 

 can and other Lichenes. By Edward Tuckerman, A. M. 

 (Continued from Vol. V. p. 422.) 



Collema leptaleum, sp. nov. : tliallo membranaceo-cartilagineo 

 suborbiculari lobato-plicato fenestrato-lacero margine elevato rugoso- 

 granulato e laste-viridi obscuriore subtus pallido ; apotheciis majusculis 

 planis disco e castaneo nigricante margine tenui evanido. Sp. in thecis 

 oblongo-clavatis 6 - Stub, vermiformi-bacillai'es apicibus obtusis, rectius- 

 culiB, 4- 12-blasta3, diam. 8 - 14° demum 20° longiores. Oa trunks, not 

 uncommon from New England to Virginia. New York, 3Ir. Russell. 

 South Carolina, Mr. Ravenel. Alabama, 3Ir. Peters. Louisiana, Dr. 

 Hale. Island of Cuba, Mr. Wright. Long regarded by me as identi- 

 cal with that state of C. fasciculare, Ach., which constitutes C. aggre- 

 gatiim, Nyl., but differing from the European lichen (Fr. Lich. Suec. 

 n. 50. Moug. & Nestl. Cr. Vog. n. 453) in its smaller, narrower spores, 

 no less than in its better-developed fronds. In the latter respect, C. 

 impUcatum, Nyl. (Lindig. Lich. N. Gran. n. 749) rivals, and is indeed 

 much like it, but the spores are more diverse than those of C. aggre- 

 gatuni. 



Trachylia Californioa, sp. nov. : thallo crustaceo gyroso-plicato 

 superficie rimuloso-ruguloso ambitu lobato glaucescente ; apotheciis in 

 veiTucis thallinis majusculis mastoideis innatis disco subplano nigro 

 margine albido sub-obsoleto. Sp. in thecis lineari-elongatis octonje, ob- 

 tusissime ellipsoidete, diblasta?, medio demum constrictae, obscure fuscae, 

 diametro subduplo longiores. On metamorphic sandstone rocks, Oak- 

 land hiUs, California, 3Ir. H. N. Bolander. May be considered, as 

 respects the thallus, the most remarkable species of the genus. The 

 granules of T. lucida, Th. Fr., become indeed scale-hke, and those of 

 T. tympanella pass at length into a more or less distinctly plaited crust ; 

 but the thallus of the present is originally plaited, and the lobation of 

 its circumference is as distinct as, and resembles, that of Leeidea (Thal- 

 loidima) Candida, ("Web.) Ach., with which species, and L. mamiUaris, 

 it also agrees in the minute wrinkling, looking often like mealiness, of 

 the surface. Apothecia immersed in conoid-hemispherical warts (about 

 half a line in diameter at the base and often a httle exceeding that in 

 height) ; the flattish, black disk, scarcely a httle grayish under a glass, 

 appearing as if bordered only by the very white edge of the thallme 

 receptacle. Examined, however, with a more powerful lens, this edge 



