1921] GOLDRING—CARBONIFEROUS WOOD 320 
with thin sections of the Oklahoma trunk, there seems no real justi- 
fication for a separation of the latter from the Prince Edward 
Island species, in spite of the great distance between the two 
localities. The original description follows: 
Cordaites recentium (Dawson) Penhallow 
Transverse.-—Tracheids 47 X53 mw broad, the walls much reduced by decay. 
Radial.—Ray cells all of one kind, about equal to two tracheids; the 
lateral walls with round pits about one ( ?) per tracheid; the cells conspicuously 
narrower at the ends. 
Bordered pits in a single row, compact, large, compressed and transversely 
oval or oblong, 15.622, the orifice very variable, from oblong to round, 
often eccentric, but typically round and central. When distant the pits are 
round and smaller. 
- Tangential —Rays medium, 1-2 seriate, the very broad cells 41 w, thin- 
walled, round and squarish. 
PENHALLOW makes no mention of the occurrence of annual 
rings of growth, which are very distinctly shown in the Oklahoma 
specimen. The rings of growth shown in the transverse section 
are variable in width; one has a width of 3 mm., a second 8 mm., 
and 6mm. of a third are shown. The growth rings show very 
well on the weathered surface of the trunk; in one place the growth 
rings have the following apices ena 3mm., 3.5mm., 7.5 
mm., 3.5mm., 3 mm., 3.5 mm., ete; im iuoehies hice, 
4mm., 4mm., 4mm., etc. On re Shee therefore, the growth 
rings are of about even width. 
The bordered pits in a single row on the radial walls of the 
tracheids distinguish C. recentium from C. materiarium, in which 
the pits are numerous throughout the tracheids, chiefly in two, 
sometimes in three or four rows. The ray cells are narrowed at 
the ends, but not conspicuously so, and are equal to 2-6 tracheids 
in the Oklahoma specimen, as in C. materiarium, the longer cells 
being more frequent. The pits on the lateral walls are round, and 
so far as can be ascertained, one to a tracheid as described by 
PENHALLOW. The rays are numerous and in general very long, 
composed of from two to at least forty-seven cells superimposed 
upon each other and tapering toward each end. The rays are 
described as “‘1~2 seriate,’”’ but usually they are uniseriate. In no 
