10 
less types and decolorate conditions; and wice versa. 
The anomalies of Collemaceous Lichens must be con- 
sidered by themselves, and in another place. And to 
this, which is now offered, for what it shall prove to be 
worth, I venture only to add the expression of my 
earnest conviction, that with all the new light which 
the researches of the last thirty years have thrown upon 
Lichenology, this study has not yet advanced so far as 
safely to neglect the wide views, divinations as we now 
know they often were, of the elder lichenographers :— 
or, in other words, that no structural detail, of whatever 
apparent value, can safely assert itself in defiance of the 
argument from general structure; or otherwise than as 
elucidated by the subtle mediation of Hasir. 
