GENERA AND SPECIES. 65 
PLATE XVIII. 
ASPLENIUM MONTANUM. Willd. 
MOUNTAIN SPLEENWORT. 
The Mountain Spleenwort has the same habitat as the 
Maiden-hair Spleenwort and the Pinnatifid Spleenwort, 
and is usually found associated with them. It is quite 
common in Kentucky, especially in the mountain regions, 
though my best specimens were obtained at Big Clifty, Gray- 
son County. A single plant had more than fifty fronds, 
each six or seven inches long; and Prof. Hussey, formerly 
of the Kentucky Geological Survey, has specimens in his 
collection over ten inches in length. Specimens are fre- 
quently found with the fronds bifurcating toward the apex, 
but only in thrifty plants. The roots are fibrous, penetra- 
ting the crevices of the rocks, as those of the A. Tricho- 
manes. 
The Plate represents a plant of average size, the tallest 
frond to the right showing a slight attempt at bifurcation. 
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