TY  - BOOK
AU  - Christensen, Carl Frederick Albert,
TI  - A monograph of the genus Dryopteris
U1  - 587.31 
PY  - 1912///-19
CY  - Kobenhavn
PB  - A. F. Host & Son
KW  - Dryopteris
N1  - CONTENTS.- PT. 1. The tropical American piunatifid-bipinnatifid spac ies
ER  -