82 V. CY8TOPTEHI8. 
The pinnae being pinnate, the pinnules also pinnate, the 
lobes deeply pinnatuid, and then- divisions notched, it is, 
though small, one of the most compound of our ferns. 
The venation is consequently compound. The Literal veins 
or venules of the larger ultimate divisions become secon- 
dary mid-veins producing alternate veinlets, which ge- 
nerally terminate in a sinus between two serratures. The 
sori are numerous, and become very prominent when ma- 
ture ; nevertheless although crowded, they do not seem to 
become confluent. The indusium is sub-rotund and very 
obtuse, attached behind the sorus, bending forward hi the 
manner of a hood towards the point of the lobe, and 
having its free margin jagged or uneven. 
The head-quarters in Britain of this very rare and 
local fern are the Highlands of Scotland, where it was 
found, first on Ben Lawers one of the Breadalbane moun- 
tains, by Mr. Wilson, in company with Professors Hooker 
and Graham, in 1836 ; and subsequently by Messrs. 
Gourlie, Adamson, Borrer, and Little, and Dr. Walker Ar- 
nott in 1841, 1850, and 1851, hi a ravine called Corrach 
Dh' Oufillach, or Corrach Uachdar, between Glen Dochart 
and Glen Lochay, hi the Mhiel Oufillach mountains in 
Perthshire. It is reported to have been found in North 
Wales by Plukenet, and we are informed that the existence 
of the species hi Wales has been recently confirmed, though 
the information is incomplete; it is not, however, im- 
probable, as the species is met with in the Alps of Europe, 
occurring most frequently hi the north, and generally on 
rough stony ground. It is also a native of the Rocky 
Mountains of North America. 
This is strictly an Alpine plant, and requires treatment 
similar to that recommended for the other species, with 
perfect rest in whiter. 
