(40) 
t. 3, f. 13-14, Koerb. Syst. p. 62. Nyl. Syn. 1, p. 329, t. 8, f. 40-42; 
Lich. Scand. p. 91. Th. Fr. Gen. p. 56; Lich. Spitzb. p. 16. Stizenb. 
Beitr. 1. c. p. 164, Schwend. Untersuch. 1. ¢. 3, p. 176, t. 9, f. 10-13. 
Peltigere sect. Hoffm. DC. Scher. Spicil. Fr. 8. 0. V. p. 240; L. 
E. p. 48. Mey. Entwick. Wallr. Germ. 
Apothecia orbicularia thallo antice innata, margine evanido. 
Spor ex ellipsoideo fusiformi-oblongz, biloculares, fuscee. Thallus 
frondosus, subtus villosus venosusque, strato corticali ibidem inter- 
rupto aut nullo. Stratum gonimicum collogonidiis aut viridibus 
aut cerulescentibus constitutum. 
Acharius misconceived the structure and affinities of this genus, as 
did Eschweiler (Syst. p. 15, 21;) and the latter, though he restored it 
finally (Lich. Bras.) to its place beside Peltigera, yet strangely, at the 
same time attributed to the whole family the mistaken character by which 
Acharius had sought to separate from it Solorina.' | There was room for 
the criticism of Fries (S. O. V.) and if lichenists followed the latter in 
fully accepting the Parmeliaceous character of the Peltigerei, it was diffi- 
cult to refuse to follow him in denying the distinctness of Solorina from 
Peltigera. This distinction turns in fact now on the sharply defined spore- 
differences. 
The apothecia of Solorina become sometimes superficial, when a 
regular, depressed, entire border, of the substance of the thallus, is occa- 
sionally to be made out. I observe this in American specimens of S. sac- 
cata, as well as in the very closely akin §. Simensis, Hochst., Flot. (Hook. 
et Thoms. Herb. Ind. Or. n. 1765) and suppose it may be taken for the 
rarely perfected true margin; only represented ordinarily by the soon 
disappearing edges of the thin veil. A similar, entire border is some- 
times to be seen in the apothecia of Peltigera, but much more frequently 
the margin, in the latter, continues crenulate. ——Spermogones scarcely 
known, either in Solorina or Peltigera. 
This small group is represented in the alpine and arctic regions of the 
earth by S. crocea, and in the temperate ones of Europe and America by 
8. saccata, The former has heretofore only occurred in Arctic America, 
but was found by Dr. Lyall of the Brit. Oregon Boundary Commission in 
the Cascade Mountains (Herb. Hook.) and more lately by Mr. E. Hall in 
the alpine regions of the Rocky Mountains. JS. saccata, affecting with us 
calcareous soils, has been found in New England (Mr. Russell) New York; 
and northward to Behring’s Straits (Mr. Wright). The curious variety 
limbata, Scher., is an inhabitant of Greenland (Vahl in Th. Fr. Lich. 
Arct. p. 49) and was found in islands of Behring’s Straits, by Mr. Wright. 
1“ F lamina proligera sola constant hujus Generis apothecia, fere wt in Artho- 
niis.” Ach. in char. Solorine, obs., L. U.p.27. “ Apothecia . . substantia tan- 
tum medullart marginata. . . . . Peltigerine.” Eschw. Clav. trib. Lich.; 
Lich. Bras. in calce. 
