TY  - BOOK
AU  - Johns,Robert J.
TI  - Holttum memorial volume
SN  - 1-900347-17-2
PY  - 1997///
CY  - Richmond
PB  - Royal Botanic Gardens, Kew
KW  - Ophioglossum
KW  - Helechos
KW  - Pteridophyta
KW  - Taxonomía
KW  - Esporas
N1  - Published to commemorate the centenary of the birth of professor R. E. Holttum 1895 - 1995
ER  -