Cassells European Ferns. 
' u.:t brooks Day 6-3. . 
POLYPODIUM DRYOPTERIS. 2. POLYPODIUM ROBERTIANUM. 
NATURAL SIZE 
3 Pinnule of p dryopteris. (upper sunder Surface) 4 pinna OF P RO BERTi A N U M (Upper Surface) 
li TIMES NATURAL SIZE lz TIMES NATURAL SIZE. 
5 PINNULE ENLARGED 7z TIMES. 
