212 THE BLADDER FERNS. 
striking and little attention is paid to 
them. The variety dentata has narrow 
bipinnate fronds with blunt pinne and 
pinnules, the latter toothed. The 
variety angustata has broad, nearly tri- 
pinnate fronds with acute, rather lan- 
ceolate, pinnules with sharply toothed 
lobes. Variety Jdaczniata has the 
pinnules cut into irregular narrow 
teeth. 
The author once collected this 
species in the mountains of a tropi- 
cal island, where it grew in the 
crevices of a ledge that interrupted 
the flow of a mountain torrent. 
When the rainy season swells 
the volume of water, all the 
fronds are washed away, but as 
soon as it subsides, a new crop 
is produced. Since there are 
two rainy seasons in this place 
the plant seems regularly to 
produce two sets of fronds 
ieee cach year. 
The Bulbiferous 
Bladder Fern. 
Cc ; Wherever there isa line of 
‘yptopteris 
eulbifera. — shaded, dripping cliffs, especial- 
ly in limestone regions, one may look for 
the bulbiferous bladder fern (Cystopteris 
BULBIFEROUS 
