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podium, so similar a at first sight, that the sole difference seems s to 
consist in their habitats, and in the different colour and size 
which appear among them. Yet after repeated examinations 
and detailed comparisons which TI made of all three, notwith- 
standing the distances at which each ef them grows, I resolved 
to establish them as distinct species, and not as varieties, as L 
had at first suppesed, being misled by the disposition of the 
leaves. In this respect I relied on the followmg difference : 
The genuine Calaguala, whose fructifications are disposed in 
two longitudinal lines, placed in quincunx order, ‘as are also 
the points of the fructifieations of these two other species of the 
Polypodium, differs from them both not only in the magni- 
tude and colour of the leaves and roots, and its’ growing on 
hills and rocks, in dry chalky soil or in caves, but ako in 
having crooked roots much more ‘fibrous and’s z sh-colou 
ed, and of easy mastication when dry ; they are 0 a more. a 
tense bitter; the figure of the leaves is more lanceolate than 
that of the other two; the leaves are also different in thick 
ness and consistency, the margins revolute, and the points or 
fructifications are more rectilinear, without deviating so much 
‘om the nerve of the leaf as those of the other two spéci es. 
which, moreover, grow im warm places, some leagues, distant 
from the hills and wilds, and delight i in Bich soils _ cS 
of trees ; they have much longer leay 
ceolate, of softer consistenc ys 
flat margins; ‘the points: of fruc 
in these than in the genuine, have not the same regularity 
in their disposition, some of them deviating from the nerve 
of the leaf towards the edges, forming occasionally three or 
four confused lines, and the exterior ones almost always irre- 
gular, Though they are distinct species from the genuine, which 
