164 



III. 



49. Lecanactis, . . . 



50. Platygraplia, . , 



51. Melaspilea, ... 



52. Opegraplia, . . , 



53. Xylograplia, . , 



54. Graphis, 



55. Cliiodecton,. . . 



56. Glyphis 



57. Arthonia, 



58. Mycoporum, . 



59. Agyrium, .... 



IV. 



60. Sipliula, 



61. Sphaerophorus 



62. Acroscyphus, . , 



63. Acolium 



64. Calicium, 



65. Coniocybe, . . . 



V. 



66. Endocarpon, . 



67. Norinandiua, . 



68. Segestria, .... 



69. Staurothele, . . 



70. Trypethelium, 



71. Sagedia, 



72. Verrucaria, . . . 



73. Pyrenula, 



74. Pyrenastrum, . 



75. Strigula, 



N.B. 



2 



19 



3 



4 

 2 

 1 

 2 

 1 

 4 

 10 



An interesting feature of onr Liclien Flora, is the fact that a num- 

 ber of species which occur in Europe, have as yet been found only 

 in the western portion of North America, from Nebraska to the 

 Pacific, only a few of which are connected with Europe through 

 the intervening Arctic region, which are indicated in the following 

 list: 



