CONTENTS. VH 



Description of Families, Genera and Species ... 81 



I. Caliciace^ SI 



II, Cladoniace^ 87 



III. Lecideace^ 102 



IV. Gbaphidace^ . . ; 124 



V. Physciace^ 132 



VI. Parmeliace^ 144 



VII. Verrucariageje 169 



VIII. COLLEMACE^ . . 179 



IX. Pannariace^ 184 



Lichens Imperfecti, or False Lichens 201 



The Continental Range of the Lichens Occurring in 



THE United States 202 



Alphabetical List of the Genera and Species Repre- 

 sented in the United States 204 



General Index 225 



Plates 235 



