Christensen, Carl. <br/><br/>
Index filicum :  supplementum quintum pro annis 1961-1975 / 
prepared by F.M. Jarrett. 
 - Oxford  :  Clarendon,  1985. 
 - 245 p. ;  24 cm. 
<br/><br/><label>ISBN: </label>0198545797 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferns--Classification.<br/>Pteridophyta--Nomenclature.<br/>Ferns--Indexes.<br/>Pteridophyta--Indexes.