INTEODUCTION 



The « Index Filicum, Supplementum Quartum » consists of: 



1. Enumeratio generum spccierumque alphalietica, being the index of 

 the names of genera, subgenera, sections, subsections and species in alpha- 

 betical order. 



2. Gatalogas litteraturae^ being the list of the books and papers quoted 



in the Index. 



3. Index nominum auctorum, being the list of the author's names with 



their abbreviations. 



4. Index abbreviationum periodicorum, being the list of the abbrevia^ 



tions of the principal serials quoted in the index. 



In order to reduce as much as possible the changes from Christensen's 

 « Index Filicum », I have adopted in general the same abbreviations and 

 signs and the same typographical form. The only fundamental difference 

 consists in the fact that bold-face types are used here for the names of 

 species which appear in the « Index Filicum » for the first time, disregarding 

 whether they are legitimate or not, whether they are to be adopted or 

 regarded as synonyms, and whether they belong to species which are to 

 be referred to one genus in preference to another. 



ENUMERATIO GENERU3I SPECIERUMQUE ALPHABETICA 



This part comprises a list in alphabetical order of the names of genera, 

 subgenera, sections, subsections and species of ferns established between 

 1934 and 1960 ; with addition of some names either omitted in Christen- 

 sen's « Index Filicum * and supplements or quoted there but with erro- 

 neous authority or bibliographical reference. 



This supplement lists only validly published names, but both legitimate 

 and illegitimate names are enumerated. 



All the novitates which result from a transfer, a change of rank or a 

 replacement of name are provided with a cross-reference to the names 

 from which they derive. Likewise all names which are transferred, or be- 

 long to taxa which are changed in rank or are replaced by new names are 

 listed with a cross-reference to the names which are derived from them. 



