TY  - BOOK
AU  - Pichi-Sermolli,Rodolfo E.G.
TI  - Index filicum: supplementum quartum pro annis 1934-1960 
PY  - 1965///
CY  - Utrecht
PB  - International Bureau for Plant Taxonomy and Nomenclature
KW  - Ferns
KW  - Classification
ER  -