IOC 
CYSTOPTERIS ANGUSTATA. 
than those on the lower side; the cuts are all along the 
sides of the leafits. These characteristics distinctly dis¬ 
tinguish this Fern from Cysto/iteris fragilia, and G. 
centata. The fructification is round, and smaller, and 
less prominent than in those two species; always 
continuing distinct, standing either in solitary masses 
or in pairs, towards the bottom of each cut dividing two 
lobes from each other; at first pale, but finally becoming 
brown. The cover ( indusium ) white, very thin, concave, 
irregularly torn, soon pushed off, or aside, by the com¬ 
paratively large, though not numerous, shining brown 
capsules. 
It is found, but not commonly, in wcodeu places on 
mountains and on shaded rocks; as near Llanberis, in 
North Wales; at Gordale, in Craven, Yorkshire; on 
shaded rocks in many parts of Scotland ; on the moun¬ 
tains of Westmorland; on the top of Glyder Mountains, 
on the side overhanging Llyn Ogwen Lake, and near 
Ffynnon felon, and on the Leek Road, about a mile 
from Buxton. 
This Fern was first discovered in llhsetia, whence its 
earliest name of Rhaticum, hut it is first mentioned as 
a British Fern by Gerard, if his Filicula petraa mas is 
really his name for the present species. There is, how¬ 
ever, much uncertainty about the early history of this 
Fern, and this uncertainty has been thus well-pointed 
out by the late Sir J. E. Smith. 
“ Great confusion has always existed amongst our Biitish 
botanists concerning Polypodium (Cystopleru) rtueticum. 
Hooker has it not. Lightfoot appears, by what he says in his PI. 
