CYSTOPTEEIS FRAGILIS. 



87 



BEITTLE FEEN, {natural size). 



Genus. — Cystopteris. Midvein of ultimate divisions dis- 

 tinct but sinuous : lateral veins branched, free : involucre 

 attached almost beneath the mass of capsules, half way between 

 the midvein and the extremity, directed at first backwards, then 



