80 PYXItfE. 



** Pyxine proper. Apothecia scutellceform, and more or 

 less resembling at first those of the first section, but soon blacken- 

 ing all over, and Lecideoid. Thallus becoming yellowish within. 



2. P. Cocoes (Sw.) Nyl.; thallus membranaceous, white- 

 glaucescent; beneath black and smoothish; lobes linear, flat, 

 many-cleft, imbricated, sparingly sorediiferous, white within ; 

 apothecia, in Cuban specimens, very small, Lecideoid, sessile, 

 flattish, the stout margin at length disappearing. Spores biloc- 



ular, ^ mic. Tuckerm. Obs. Lich. I, 1. c. p. 401 ; <&4,p. 166. 



Lecidea, Ach. L. U. p. 216. 



Trees in tropical America, and perhaps recognizable in some 

 small forms from our extreme south. But I consider the name 

 as only the first imperfect indication of the more delicate states- 

 of the two following forms of Pyxine. 



2(b). P. Meissneri, Tuckerm. j thallus much as in P. Cocoes, 

 but more or less yellow within, and scarcely sorediiferous ; spar- 

 ingly black-fibrillose beneath ; apothecia scutellaeform, small, a 

 flat, black disk bordered by a sub-entire thalline exciple, itself 



at length blackening. Spores as in the preceding. Obs. 



Lich. 1, 1. c. p. 400. P. Cocoes, v. Meissneri, Obs. Lich. 4, I. c. 



Trees, as the preceding, from which it is commonly taken for 

 distinct ; as it is often well distinguished. I have however seen 

 no North American specimens. 



2(c). P. sorediata, Fr.; stouter, cartilagineous, wrinkled- 

 plaited; glaucous- cinerascent becoming gr eenish- olivaceous ; 

 more or less sulphur-coloured within ; the lobes beset with 

 rounded, white or grey soredia, and beneath densely fibrillose ; 

 apothecia commonly Lecideoid, small, at length dilated and 

 flexuous, the hypothecium resting on a yellowish or fulvous 

 stratum, the disk white-pruinose, or, more commonly, naked. 



Spores bilocular, ~ mic. Fr. S. 0. V. p. 267. P. Cocoes, v. 



sorediata, Tuck. Obs. Lich. 1, I. c. p. 402. Lecidea, Ach. Syn. p. 

 54. Parmelia, sect. Pyxine, Tuck. Syn. N. E. p. 35, & Lich. 

 Amer. n. 19. 



* Eschweileri, Tuckerm.; spores 4-locular, ^ mic. Obs. 



Lich. 4, I. c. Lecidea sorediata, pro p., Eschiv. Bras. p. 245. 

 Wright Lich. Cub. n. 94, pro p. 



Trees and rocks. Pennsylvania (Muhleriberg), Ach. Syn. 

 1814. Common from New England to Virginia, Tuckerman, and 



