






















106 NATURAL HISTORY MISCELLANY. 
one which commended itself as sufficient to Floerke, and, at one time, 
to Borrer; and there seems to be no doubt that this origin P. revoluta — 
e 
shows no reaction; while, on aa ue » an a ‘Muro pean condi 
(Herbarium Krempelh.) is not wanting, soc far less with revo 
than with levigata, the evident reaction in which favors the inference 
that the latter varies possibly in its TRAS relations as much as the 
former; and that the new criterion is after of no service. In al 
tinged red by the same salt, as stated by Nylander; but only two or three | 
of the much more abundant North A American ones 3 Sho w any trace of the 
stanced s the var. chen ta Nyl. (Lindig’s Herbarium of New Granada), 
of which No. 110 of the second collection exhibits the coloration, while 
yet the contrary the c ; 
American specimens, as well “hes Arctic America as es ‘Ton in 
—but some (it is worthy of note) eufictenty x normal. P. Borreri W 
longs, it is further said, to the number of species which exhibit the 
reaction; but none is observable in several fnan North Am 
specimens in my herbarium, and the same is true of the New G 
P. Borreri Nyl. (Lindig’s Herbarium, No. 735). The group represe! 
by P. physodes is, on the other hand, set down as not affected by the! 
in the way named. P. Japonica, of the erent hir belongs none 
less to the group, and exhibits a free colora So Dirina is reckon" 
genera aying “a very distinct ratier reaction;” yet 
Californian species (D. Californica) fails to d 
other cases; but in what appears rather a corticoline form of P. cons 
from Louisiana (var. leucochlora Nyl.), the change is to bright Y® 
not without orange, contrasting with the entire want of coloration ! 
erpe every and perhaps therefore not unworthy of note in the P! 
iscuss 
These results, given with due respect to the experienced authors 
observations have been considered, sufficiently indicate that the 
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