[ &79 ] 
6. Lichenes erecti ramofi plani. 
Such as conjift of a firm tough matter , difpofed into 
fiat and thin ramifications growing ereft, and 
bearing their fcutellae upon the edges, furfaces , 
and at the extremities. 
This divifion comprehends the flat branched tree- 
moffes of authors ; many of the fourth order of 
Haller’s lichens ; the firft part of the fecond divifion 
of feries the fecond in Dnlenius ; and the plat if mu 
of Hill. 
The plants of this divifion grow upon old trees, 
efpecially in thick and unfrequented woods ; fome of 
them upon rocks : they are many of them extremely 
common in England upon all kinds of trees. As 
they were fome of the mod obvious, fo they were 
fome of the firft lichens noticed by the old writers, 
by whom they were called lichenes arbor um. 
The modes of this order were fubftituted in the 
room of the ufnea in the compofition of the pulvis 
cyprius. The very fpecies, which was mod: frequently 
ufed for this purpofe, was the channel-leaved lichenoides 
of Dillenius (9), on account of its being eafily reduced 
into a fine powder, of a good white colour. Ne- 
verthelefs, others are undoubtedly as well adapted to 
the fame purpofes : and, if it was of importance 
(9) Lichenoides coralliforme rofiratum et canaliculatum . . Hift. 
Mufc. 170. Lichenoides arbor eum ramofum angujiioribus cinereo- 
virefcentibus ramutis. Raii Syn. 75* Lichen c a Hear is Lin. Spec. 
Plant. 1146. . 
enough 
