
          the new [Evernia?] to which I have attached the name
of 15 distinguishes discoverers, and I shall gladly [?]
& where possible publish in the exsiccata, all the 
species which you may be able to procure for me.
Will you let me add that if any additional
expence be caused by these collections, I shall
be glad to be permitted to bear it. It must
be long before the lichens of our vast flora
are fully settled - but the more northern section
will be far the easiest to bring into good scientific
order - and these are more easy not
merely in structure, but in the abundance of authorities
which we possess to illustrate them. I 
hope to bring out sometime within the present
year a succinct enumeration of North-American 
lichen to include the whole of North America
with descriptions of the many new species which
are in my herbarium - entirely for the use
of lichenists however, and only preparatory to a
future work which must contain microscopical
characters derived from the [arci?] & sporidia. This
last, if I am able, I hope to do what I can to -
words, in a gradual way, by some serial publication.
        