Concepción, Ismael Landrón. <br/><br/>
The lichen genus Ramalina Ach. in the West Indies with notes on its role in the vegetation of Puerto Rico 
by Ismael Landrón Concepción. 
 - Ann Arbor, Mich.  University Microfilms  1973. 
 - xiv, 342 leaves. 
<br/><br/> Facsimile produced by microfilm-xerography. 
<br/><br/>Thesis--Michigan State University, 1972. 
<br/><br/>Bibliography: leaves 311-326. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lichens--Puerto Rico.<br/>Botany--Puerto Rico.
<br/><br/><label>National Agricultural Library Call No.: </label>DISS  / 73-5,422