[ 6 S 6 ] 
tells us he learnt to diftinguifh almoft all the mofies 
folely by the help of thefe tables, fo well are they ex- 
preffed. The lovers of botanic fcience are greatly in 
debted to Boerhaave for his publication of that work. 
Micheli, after To urnefort, adopts the term lichen , 
and comprehends all the fpecies under it, except one 
or two, which he calls lichenoides. This author 
however does not take into this genus the liverwort 
of the materia me die a ; he deferibes the fpecies of 
that genus under the name of marchantia. Near 
twenty of the plates in his Nova Plant arum Genera 
are taken up in reprefen ting various fpecies of this 
genus. In this work they are divided into thirty- 
eight orders or fubdivifions ; a circutnftance very ne- 
ceffary indeed, confidering how greatly he has multi- 
plied the number of the fpecies. It is to be regretted, 
that fo indefatigable an author, one whofe genius 
particularly led him to ferutinize the minuter fubjedts 
of the fcience, fhould have been fo folicitous to in- 
creafe the number of fpecies under all his genera: 
an error this, which tends to great confufion and em- 
baraffment, and mull retard the progrefs and real im- 
provement of the botanic fcience. 
Dr. Halier retains Micheli’s term, and enumerates 
160 kinds in his Enumeratio Stirpiujn Helvetia : he 
divides them into feven orders, according to the fol- 
lowing titles : 
1. Lichenes corniculati & pixidati. 
2. Lichenes coralloidei . . 
3. Lichenes fruticoji alii. 
4. Lichenes pulmonarii. 
y. Lichenes crujlacei Jcutis jloralibus ornati . 
6. Lichenes Jcutellis ornati. 
y. Lichenes crujlacei non Jcutati, 
The 
