1877. ] 175 {Lesquereux. 
geners ; I have especially examined, in comparison, the described forms of 
Rhizomorpha subcorticalis, where I find characters which have removed 
my first hesitation in regard to your views. One of these forms, the teredo 
of Persoon, has few ramifications, nerves anastomosing, and the primary 
branches are flattened, enlarged and rugose as in the fossil specimen from 
Cannelton. The form Jatissima described by Kick, in the flora of Flanders 
from under the bark of Betula alba, has a flattened body resulting from the 
impression or cohesion of some stems, ete. 
From the specimens communicated to me, most of the forms of R. sud- 
corticalis present the mode of anatomosis in abnormal direction, as seen at 
the base of the branch ec. Others have a flattened stem when unfolding 
under some closely pressed piece of bark ; but the branches generally take 
their cylindrical form when they come to more space especially where air 
is accessible. Though it is always difficult to find the top of the branches 
they are generally inflated or club-shaped as in the fossil specimen. 
Dr. Roumeguére adds to the dry specimen a figure of R. subcorticalis, 
which represents a stem flattened and enlarged, as is the body of our fossil, 
with branches bearing at the surface small tubercles composing a false 
peridium, one of which, more advanced into maturity, has produced a club 
shaped body identically similar to those of Hilariu digitata, an autonome 
Fungus. This production has been as yet very rarely observed. Except 
that the ramifications of the branches of that living species are longer and 
not inflated at the top, which is not discernible in the specimen, the fossil 
form is remarkably similar to it. 
I received also from Professor C. H. Peek, of Albany, some specimens 
of Rhizomorpha more or less representing the character of R&. Sigillaria. 
No fossil plant published until now from any of the geological forma- 
tions of Europe or of America hasany relation to this. In Sternberg, Vers., 
Aphlebia tenuiloba, represented in Vol. II, pl. lviii, fig. 2, might be 
quoted as bearing some relations to the plant of Cannelton by its branches 
irregularly diverging from an enlarged amorphous central nucleus. But 
though this species,a mere variation of A. adnascens, Pr., represents a 
parasite plant, it has, like the others described under this generic name, a 
distinct system of nervation, according to which, the divisions of the pri- 
mary stems are in an outside or upward direction, and therefore do not, 
and cannot anatomose either in right angle or in abnormal direction, as 
is the case with plants of cellular tissue. Thus we would have only for 
comparison, outside of the Mungi, marine plants or Fucoids, and of course 
the presence of marine plants in connection with Sigillaria, even under 
the bark of trees of this kind, is an impossibility. 
Habitot. I found this vegetable organism in shaly cannel or cannel shale 
of the Cannelton coal, of Beaver County, in company with the proprietor, 
Mr. I. F. Mansfield, who in pursuing systematic researches for fossil remains 
has obtained a remarkably rich series of rare and new species of plants of 
the Carboniferous. The character of a rib of Sigillaria is easily recog- 
nized upon the figure of the specimen, which bears also one round scar 
of the under surface. The upper layer of bark transformed into coal 
was broken in small fragments to fully expose the fossil Fungus. 
