
          Amherst 9 July 1856

Dear Sir

I believe I can  give you a
fuller account of the lichen from the sands
near "Inscription rock", which you kindly sent
me the other day. I called it a variety
(terrestris) of Parmelia conspersa, and I
still do not think that a very strange
opinion : through microscopical examination
will be required to establish it.
But there is figured in  [Olaf] Swartz's [?]
"Lichenes Americani" Fasc. I.", Nurimb. 1811,
(of which I never saw any copy but my
own, still therefore take leave to add that
both the letter-prep, as well as certainly
the figures are by [Erik] Acharius, & that there
was no more of the work published) a
Parmelia congruens, Ach. [Acharius], of which it is
said " incolit arbores Americae borealis. In
Nova Anglia observata". Of this lichen
I have [?] failed to get any information
either here or in Europe. In my synopsis
of Lichens of New England, etc. I put
it among that  group of Parmelias which
        