Hale, Mason E. (Mason Ellsworth)  <br/><br/>
A synopsis of the lichen genus Xanthoparmelia (Vainio) Hale (Ascomycotina, Parmeliaceae) 
Mason E. Hale 
 - Washington  Smithsonian Institution Press/  1990 
 - 250 p. :  ill. ;  29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Xanthoparmedia--Classification