THE MOUNTAIN BLADDER FERN 
unequal, ascending, the lower pair considerably largest, two inches and a half long, obliquely ovate 
th а the anterior ones; some of the other pinna» are also unequal- 
posterior pinnules being largest, but at the top this difference is not manifest 
the lar ovate, pinnate, or the smaller upper ones pinnatifid, Pinnulete 
тесей by a 
the larger pinnules, ovate with a distinct narrowed stalk-like attachment, but c 
narrow wing, pinnatifid, with oblong-ovate obtuse lobes cut into linear teeth which are generally bifid at 
the extremity, In its ultimate divisions it is thus very much like С, regía. 
Venation of the pinnules, consisting of a nearly straight midvein, with alternate veins directed one 
into each lobe; a venule is given off towards the teeth, and is continued to the margin, where it is lost 
in the sinus formed by the bifid apex of the tooth, thus ending in a depression rather than a projection 
of the margin, 
Fructification occupying the whole under surface, Sori consisting of numerous moderate sized, 
roundish masses of sp 
‘eases, medial on the veins, indusiate, Ind 
пайот, a delicate transparent, con 
cave, subrotund membrane, irregular at the margin, placed at the back of the sorus, and soon 
Duration, The rhizome is perennial, ‘The 
onda are annual, and appear about May, perishing 
This plant is at опсо known from the other British species of Cystoptoris by its long creeping 
rhizome, and its triangular and tripinnate fragile fronds, It has much more the aspect of Polyp 
Dryopteris, for which it mig] 
lt, perhaps, be mistaken—the more readily, as its indusia become soon 
obliterated, and the sori then seem to consist of round naked ma: 
es of spore-cases. It is, however, not 
three-branched, as that is, and is more divided, 
‘This plant has hitherto proved difficult to cultivate, probably on account of the slight information 
which was possessed 
f the peculiarities 
its native habitats, Now, however, that it is known that its 
rhizomes thread their way on the ledges of dripping rocks, am 
ш beds of sphagnum, it may be 
supposed that less difficulty will be experienced. These natural conditions suggest the employment of 
(L) broad shallow vessels; (2) а very open medium for the roots, such as light turfy peat and 
sphagnum intermixed and blended wit 
h sand; and (3) constantly abundant, yet not stagnant, moisture 
‘The ereeping rhizomes afford every facility for propagatio 
gilt 
ше 
