Pichi-Sermolli, Rodolfo E. G. <br/><br/>
Index filicum :  supplementum quartum pro annis 1934-1960 / 
prepared by Rodolfo E. G Pichi-Sermolli with the collaboration of F. Ballard ... (et al.). 
 - Utrecht :  International Bureau for Plant Taxonomy and Nomenclature,  1965. 
 - 370 p. ;  25 cm. 
 - Regnum vegetabile  v.37. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ferns--Classification.