Hale, Mason E. <br/><br/>
A revision of the lichen genus hypotrachyna (parmeliaceae) in tropical America / 
Mason E. Hale, Jr. 
 - Washington :  Smithsonian Institution Press ;  1975. 
 - iii, 73 p. :  ill. ;  26 cm. 
 - Smithsonian contributions to botany ;  25. .
 - Smithsonian contributions to botany ;  25. .
<br/><br/> Includes bibliographical references (p. 69-71) and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hypotrachyna.<br/>Lichens--Latin America.