( i8 ) 
GROUP I; GENUS VII; SPECIES I. 
CYSTOPTERIS FRAGILIS. (Brittle Bladder Fern.) 
Plate VIII. 
Fronds. Lanceolate, bi-pinnate. Pinnae lanceolate. 
Pinnules ovate or triangular, deeply pinnatifid; 
lobes slightly serrated. Rachis green. Stipes 
less than half the length of the entire frond ; 
dark and scaly at base. Fronds very brittle. 
Growth. Erect. 
Height. From three inches to one foot. 
Colour. Light, bright green. 
Habitats. Generally distributed, but rarer in the 
south-eastern counties. 
(See also page 53.J 
CYSTOPTERIS FRAGILIS , variety ANGUSTATA. 
(Narrow Bladder Fern.) 
Plate VIII. 
Fronds. Rather larger than Cystopteris Fragilis; 
apex of fronds and of pinnae drawn out and 
attenuated; pinnae farther apart. Texture 
thin. Not uncommon. 
CYSTOPTERIS FRAGILIS , variety DEN TAT A. 
(Toothed Bladder Fern.) 
Plate VIII. 
Fronds. Rather smaller than Cystopteris Fragilis. 
