Johns, R. J., ed. <br/><br/>
Index filicum: supplementum septimum, pro annis 1991-1995 

 - [London]  Royal Botanic Gardens  1997 
 - viii, 124 p.   23 cm. 
<br/><br/><label>ISBN: </label>1900347261 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PTERIDOPHYTA<br/>INDICE<br/>NOMENCLATURA