120 CYSTOPTERIS FBAGILIS. 
nicutn." He calls it " Filix saxatilis caule tenui fragile i 
Fine-cut Stone Fern, with slender and brittle stalks. 
On old stone walls and rocks in the mountains of the 
Peak, in Derbyshire, and in the West-riding of York- 
shire, and in Westmoreland plentifully. Dr. Tancred 
Robinson found this Fern on the dropping rock at 
Knaresborough, from which the petrifying water 
distils." 
The cultivation of this species is the same as that of 
Cystopteris alpina previously stated, and in addition 
we quote the following from Mr. Moore's " British 
Ferns " : 
" From the delicate texture of this Fern, and its adap- 
tability to various situations, it is well suited for cultivation ; 
and grows vigorously planted either on. rockwork or in pots, 
and placed either within a frame or without one in a shel- 
tered and shady position ; it however becomes most oeau- 
tiful when developed in the damp close atmosphere of a 
frame or glazed case. The small size of the plant renders 
it more convenient for pot culture than many other kinds. 
The other species of Cystopteris are similar in habit, and 
may be cultivated in the same manner. The dormant 
crowns should not be kept too damp during the winter. 
They all propagate readily by separating the crowns when- 
ever more than one is formed, and most of them form new 
crowns rapidly." 
