[ 6 S7 ] 
The extenfive number of the fpecies, and the diffi- 
culty of diftinguifhing them with a tolerable degree 
of certainty, has deterred Dr. Haller from adding fo 
full and complete a lift of fynonyms to the plants of 
this genus as he has elfewhere done in that fplendid 
work. Plate the 2d exhibits feveral elegant forts of 
thefe lichens. 
Linnaeus, and the followers of his method, who 
feem to have eftablifhed their generical character 
from Micheli’s difcoveries, retain alfo his generical 
title. Micheli’s paflion for the multiplication of fpe- 
eies is no-where more confpicuous than in the plants 
of this genus, which he has moft enormoufly aug- 
mented to the number of 298 fpecies. The Swedifti 
profeftor cannot be charged with this foible : it is 
one of the excellencies of his writings, that they in- 
culcate the reverfe. He has fo far retrenched this 
genus, that in his general enumeration of plants he 
recounts only eighty fpecies belonging to it. They 
are in this work divided into eight orders, according 
to the difference of appearance which they form by 
their facies externa, little or no regard being had to 
what are ufually called the parts of fructification. 
1 . Lichenes leprofi tuber culati. 5. Lichenes coriacei. 
2. Lichenes leprofi fcutellati. 6 . Lichenes fcyphiferi. 
3. Lichenes i rubric ati. 7. Lichenes frudliculofu 
4,. Lichenes foliace 'K 8. Lichenes filamentofi*. 
Dr. Dillenius, in his moft elaborate work, intituled, 
liiforia Mufcorum , has divided this Michelian genus 
into three, under the names of ufnea, coralloides , and 
lichenoides. Under the word ufnea he comprehends 
the hairy tree-moftes, among which are the ufnea of 
Vol. 50. 4 P th e 
