Fern-flora of Canada p. 233. 1889 
Cystoptaris fragilig var. Maekayii ,^Lawson.has narrowly lanceolate, dark or dull 
green pinnae, far apart, the pinnules wedge-shaped at base, and rounded at apex. 
Widely distributed all over Canada, but only on shady, rocky banks or hillsides, 
and chiefly where the air is kept moist by neighboring lakes, rivers, or the sea. 
Var. Maeka yii is a common form in Nova Scotia. The name of the genus is derived 
from the texture and form of the indusium, which is like a minute inflated bag or 
bladder® ' 
