Hale, Mason E., Jr. <br/><br/>
A revision of the lichen genus Hypotrachyna (Parmeliaceae) in tropical America 

 - Washington :  Smithsonian Institution,  1975 
 - 73 p.  : ilus. ; gráfs. 
 - Smithsonian contributions to botany  ; 25 .
 - Smithsonian contributions to botany  ; 25 .
<br/><br/><label>LCCN: </label>24295 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hypotrochyna.<br/>Líquenes.<br/>Parmeliaceas.
<br/><br/><label>Dewey Class. No.: </label>589.1  / H35