THELOSCHISTES. 51 



On trees, and stones ; occurring in a wider, regularly laciniate 

 form fully represented by German and Italian specimens (as 

 Massed, n. 36) but, like the American T. polycarpus, yet better 

 developed, and found from the coast of New England, Tucker- 

 man I. c. 1860, to Wisconsin, Lapham; and, still more commonly, 

 in a narrow, and much dissected state ( f. laciniosa, Scbser. Helv. 

 n. 381) which occurs throughout the United States, from New 

 England, J. L. Russell, to South Carolina, Eavenel, Texas, 

 Wright, and California, Bolander. This last form assumes the 

 characters of the present, but in most respects it is now fully 

 associable with stellate conditions of T. polycarpus, and may be 

 said to connect the two. 



b. pygmceus, Fr. ; sub-orbicular and pulvinate, or effuse ; 

 fulvous or orange ; the minute, irregularly cleft divisions thick- 

 ened and becoming erect and more or less terete-branched 

 above, the tips and margins at length granulose; apothecia 

 smallish, orange, with an entire or granulate margin. Spores as 



in T. parietinus. Parmelia parietina, v. pygmsea, Fr., L. E. 



p. 73. Physcia pariet. v. Finmarkica (Ach.), Tuckerm. 1. c. 



On rocks. Islands of Behring's Straits (Wright), Tuckerman 

 I c. 1860. Alaska, Dr. Kellogg. Coast of California, Bolander. 



2(c). T. ramulosus, Tuckerm. ; thallus effuse, pale-yellow; 

 made up of minute, scattered, sparingly divided, semi-terete 

 lobules, which are decumbent, and at length sub-imbricate; 

 apothecia minute, entire, of the same colour. Spores as in T. 



parietinus. Physcia parietina, v. ramulosa, Obs. Lich. 1,1. c. 



p. 385. 



On bushes, coast of California (Wright}, Tuckerman I. c. 

 I860: Best comparable in habit, and the colours, with T. con- 

 color ; but diverse in the spores. Too little as yet known. 



3. T. concolor (Dicks.); thallus foliaceous, orbicular, green- 

 ish-yellow, or now ash -coloured ; the very narrow divisions 

 lacero-laciniate and now much dissected; pale, and becoming 

 densely fibrillose on the under side; apothecia small, wax- 

 yellow, becoming fulvous and rufous, with a mostly entire mar- 

 gin, more or less fibrillose beneath. Spores numerous (20-60) in 

 the thekes, simple or imperfectly bilocular, ^ 2 inic. Phys- 

 cia candelaria, Nyl. Prodr. Gall. p. 60; Syn. I, p. 412; and in 

 Lindig Herb. N. Gran. n. 2600. Tuckerm. Obs. Lich. 1. c. 4, p. 

 387. Parmelia fibrosa, Fr. S. 0. V. p. 284. Tuck. Lich. exs. 



