Mr. 'l'ugNzEn's Description of a new Species of Lichen. 261° 
d 
from every other individual of the tribe, called by Acharius Ca- 
licium, and seems to afford an intermediate link between these 
and the very numerous but widely removed varieties of Lichen 
pyvidatus.. Tam acquainted with no species with which there is 
. a possibility of its being confounded. It grows on the sides of 
old barns, in large patches, conspicuous to the naked eye at a - 
distance, only from their black, almost sooty appearance, so that. 
it may easily be passed by as Lichen niger or wmbrinus. The 
peduncles hardly elevate themselves above the crust; the pow- 
. der with which the tubercles are filled is of a particularly dull 
though pleasing colour; but their thin, beautifully pale yellow, 
or whitish margin will not fail to attract attention as soon as the 
plant is carefully observed. However it may perplex the builder 
of a system, it is highly pleasing, as well as curious, to observe 
the gradations of Nature from the Calicium sessile, which, having 
no crust of its own, attaches itself to other species, and when 
found on Lichen pertusus forms the Lichen gelasinatus of Wither- 
ing, to the present species, which, from its fruit, must necessa- 
rily be placed in the same subdivision, but at the same time is, in 
point of crust, almost sufficiently removed to require its. being 
arranged in a different genus. 'The real observer of Nature, who 
studies her in the open air, must be prepared at every step to 
meet with difficulties of this kind, which are unknown indeed to 
him who frames theories only in his closet, but which, at the 
same time that they convince him of his ignorance, impress upon 
his mind the most sublime ideas of the wonders of the creation, 
. and lead him necessarily to the true object of natural history—the _ 
adoration of his Maker in the works. of His Hand. e 
Yarmouth, March 31, 1804. 
V, Account - 
