
          includes P. stellaris (Physcia [?]) and
Acharius compares it (in his Lichenographia)
with a species of that group.

I found however that I possess a bit of
a specimen from [Heinrich Gustav] Flörke's collections, which
is ticketed "Camtschatka Tilesius" and
named "P. congruentis, Ach.", which is certainly
the same with the lichen from
Inscription rock - & with this [light?]
I am also satisfied that the desciption 
of Acharius is also sufficently accordant
with your specimens - far more so indeed
than his cited figure - by which alone I 
could not possibly have determined our
lichen.

The name will therefore be P. congruens,
Ach. Syn. p. 204; but it is to be noted
that Acharius's plant is said to inhabit
trees, which your specimens are from the 
earth, and Dr. [F. V. (Ferdinand Vandeveer)]Hayden's from Nebraska
also - except that he adds one bit 
apparently of the same, but still more
like states of P. conspersa, from rocks,
from which also [Wilhelm] Tilesius's lichen was
[received?].

P. congruens does not
seem to be known at all the lichenists
of this day - and I fear it would not
        