162 



which is that followed in this paper, the Parmeliacei contain in 

 North America, 38 Genera and 411 species; the Lecideacei, 10 

 Genera and 218 species; the Graphidacei, 11 Genera and 79 species; 

 the Caliciacei, 3 Genera and 40 species ; the Verrucariacei, 10 Gen- 

 era and 75 species. Of the 18 families into which these five tribes 

 are diyided, the Usneei contain 7 Genera and 67 species; Parmeliei, 

 5 Genera and 52 species ; Umbilicariei, 1 Genns and 21 species ; 

 Peltigerei, 5 Genera and 38 species ; Pannariei, 2 Genera and 27 

 species ; Collemei, two snb-families, 7 Genera and 68 species ; Le- 

 canorei, three snb-families, 12 Genera (including Myriangium) and 

 412 species ; Cladoniei, 3 Genera and 57 species ; Coenogonii, 2 

 Genera and 3 species ; Lecideei, three sub-families, 5 Genera and 

 217 species; Lecanactidei, 3 Genera and 8 species; Opegraphei, 3 

 Genera and 31 species; Glyphydei, 2 Genera and 3 species; Artho- 

 niei, 3 Genera and 79 species ; Sphaerophorei, 3 Genera and 6 species ; 

 Caliciei, 3 Genera and 40 species ; Endocarpei, 2 Genera and 10 

 species ; Yerrucariei, three sub-families, 8 Genera and 75 species. 



The geographical distribution of the species is shown in the fol- 

 lowing table. In the first column is shown the number of species and 

 sub-species in each genus ; in that marked N., the number of North- 

 ern species ; S., of Southern species, including the territory south 

 of Pennsylvania, the Ohio river, and thence west to the Southern 

 boundary of California ; G., species more or less widely distributed 

 in both of these regions ; W., species occurring only west of the 

 Mississippi, and north of the column indicated by S. (including 

 also a few Arctic species as hereafter noted) ; ^//j., Alpine and sub- 

 Alpine species ; Arc, Arctic species ; Tr., Tropical and sub-Tropical 

 species; N. Am., species peculiar to North America; Eii., species 

 occurring also in Europe ; N. E., species occurring in New England. 



