
          advises me to refer to our northern "Cetr. juniperina" (C.
juniperina v. virescens Tuckerm. Syn.) either to C. pinastri
of wch it will form an interesting low-country form - which
I entriely agree in - having ventured myself to refer some of 
my own specimens to C. pinastri years ago. But such criti-
cisms as these (which are all Fries made) do not affect
the value of the work in the least. The difficulties lay
in the Cladoniae, which are all unquestioned. I have
material ready for about four fasciculi, making two
volumes more, but cannot tell now when I can sit
down to it, or even look up anybody else to attend to
it. Meanwhile, thanks to you (for the Texan bundle, sent
sometime since, no less than all your beautiful Califor-
nians - Ramalina menziesii Taylor (the reticulate one;)
Evernia xanthocarpa Tuckerm. MSS. (the large black fila-
mentous one like Evernia jubata) E. vulpina, &c &c.)
and many most excellent Southern concepts, my stores
increase. I am well equipped with Carolina lichens; have
many Georgians; a large box of Louisianans not yet examd;
some Floridian; and a world of Texans; beside Santa Fe,
California N. I shall limit my studies henceforth to lichens
+ the Potamogetons - If I extend beyond the last - Phanero
gamia, it will be only in a monographical way; for I cannot
pretend any longer to try to keep up with general Botany. I am
living in my own house at length, and hope I may sometime
have the great pleasure to see you in it. With great respect
I am truly yours
Edw. Tuckerman
        