18 
chiefly in having fewer veins on each side of tho leaf, and the veins 
less prominent. The usual number of veins on each side is 7, but I 
have seen as few as 5 and as many as 9. The leaf is almost 
always broadest beyond the middle, the lobes are smaller, and, as 
well as the teeth, more acute, the terminal tooth into which the 
main vein runs not much exceeding the others. The leaves have 
much the same texture as in P. eu-aria, and at first are nearly as 
pure white in colour, but ultimately have a much greyer tinge* 
The tomentum is looser in texture below, and the arachnoid covering 
disappears sooner from the upper surface, for though remaining till 
the leaves attain their full size and the plant is in bud, yet I have 
not seen any traces of it in specimens which have the flower fully 
developed. The fruit is smaller than in P. eu-aria , f inch in 
diameter, and the scarlet slightly inclining to carmine, which shade 
of colour I have not seen in P. eu-aria . This plant seems to be 
peculiar to limestone rocks, and may be but a rupestral form of 
P. eu-aria. It will be observed, however, that Mr. C. Bailey, in 
his note given above on its occurrence in Lancashire, speaks of its 
being often found not only in stations where it must be regarded 
as truly native, but also in plantations. From this I infer that it 
occurs in the plantations still distinguishable from P. eu-aria, though 
I regret much that some of these plantation forms have not come 
under my notice. I believe P. rupicola to approach most nearly to 
Sorius grceca, Lodd., which is placed by Boissier as a variety of 
S. Aria. It differs from P. rupicola in the leaves being smaller, 
more snowy white beneath than even those of P. Aria , and the 
veins on each side varying from 5 to 8, but usually 6. Sometimes 
the leaves of S. grceca are rather deeply lobed ( i.e ., the lobes about as 
long as broad), deepest at or confined to the apex of the leaf centra^ 
tooth into which the vein runs not conspicuously larger than the 
others. Of this group there are in Prof. Beichenbach’s collection 
two examples named S. grceca, and another which appears to be the 
same thing, named “ Sorius Aria, var. incisa, Bose.” “ Friedersdorf 
Col. Karl.” Another specimen called “ Sorius Aria, Sierra Nevada, 
9000 feet, Hisp. Willkomm.,” is intermediate between grceca and 
rupicola. A specimen in the same collection, labelled “ Sorius Aria, 
Krain,” seems to me true rupicola. Another named Sorius 
ollongifolia , Beich., FI. Germ., 2252, Krain, Dobrana, Fleischmann, 
I believe to be also an abnormal form of rupicola, from its small 
flowers and glabrous upper surface of leaves, though I almost agree 
with Mr. Watson, who thinks it “as near Dr. Syme’s Beigate speci- 
mens of P. eu-aria as to Mr. Whittaker’s Buxton specimens of P. 
