PHYSCIA. 75 



Trees. Seaboard of South Carolina (Ravenel), Tuckerraan 

 I c. 1860. Georgia, Ravenel. Florida, Austin. Louisiana, Hale. 



Texas, Wright. * Louisiana, Hale. P. dilatata, f. integrata, 



Nyl. Syn. 1, p. 424, 'sufficiently like P. crispa' but with wider, 

 lobes, the margins of which are not powdery, is found at Orizaba, 

 Mexico, Nylander 1. c. ; where also P. major, Nyl. ibid., of the 

 same affinity, is said to occur. Neither is sufficiently known to 

 me. 



7(d). P. tribacia (Ach.) Tuckerm. herb.; thallus smallish, 

 sub-membranaceous, sub-stellate, glaucescent; beneath white, 

 and sparingly white-fibrillose ; lobes abbreviated, those of the 

 periphery appressed, more or less dilated or now narrowed, and 

 flat, but with ascendant and erose-granulate edges, and crowded 

 at the centre into a granulate crust; apothecia smallish to 

 scarcely middling-sized, closely sessile, black, commonly grey- 



pruinose, with a sub-entire margin. Spores ^^ mic. Leca- 



nora, Ach. Syn. p. 191, in part. Parmelia, Schorr. Enum. p. 

 39. P. erosa, Borr. ! in E. Sot. Suppl. n. 2807. P. stellaris, 

 var. tribacia, Fr. L. E. p. 83. Physcia stellaris ft, tribacia, 

 Tuckerm. 1. c. ; & Lich. Amer. n. 85. 



Trees and rocks (in the former habitat thinner and flatter, 

 and, in the latter, more cartilagineous, convex, and grayer 

 so that if we take the former for a descendant of P. stellariSj 

 we might incline to consider the latter as in similar relation to 

 P. ccesia (comp. Fr. L. E. p. 84, & Tuckerm. I. c. p. 397) but 

 this is perhaps to set too high a value on the lichen last-named, 

 the specific rank of which is confessedly open to question) 

 common from New England, Tuckerman Syn. 1848, to Virginia. 

 South Carolina, Eavenel. Louisiana, Hale. California, Bolander. 

 A very common, quite distinct, and well-marked lichen. 



7(e). P. hispida (Schreb., Fr.) Tuckerm. herb. ; thallus small, 

 sub-cartilagineous, glaucescent ; beneath white ; at first sub- 

 stellate, but ascendant and diffusely ca3spitose, and the short- 

 ened, erectish, imbricated lobes inflated and vaulted at the tips, 

 and ciliate throughout with long, darkening fibrils ; apothecia 

 smallish to scarcely middling-sized, sessile, grey-pruinose, with 



mostly entire margin. Spores as in the last preceding. 



Borrera tenella, Ach. L. U. p. 498. Parmelia stellaris b. hispida, 

 Fr. L. E. p. 82. Physcia, Tuckerm. I c. p. 397. 



Trees and rocks. Arctic America (Richardson), Hooker I. c. 



