342 BOTANICAL GAZETTE [APRIL 
to PENHALLOw, “‘in the tangential section only, probably in conse- 
quence of the special condition of preservation,” though what that 
“special condition” may be when the sections are all made from the 
same block is not evident. This feature, however, is considered 
important enough, in spite of the above described cordaitean 
features, to “separate the plant from Cordaites, and its affinities 
are rather with the Pityoxylon of Kraus.” 
In the tangential section there are four broad medullary rays 
(plate fig. 3, a, b, c, d) with their tissues in a fair state of preserva- 
tion, the two best preserved of which are shown in figs. 6 and 7. 
There are also traces of two more. PENHALLOW’s description of 
these is ‘‘fusiform rays, the terminals linear and of the structure of 
the uniseriate rays; the central tract very broad, nearly round; the 
cells large, thin-walled, irregular, and enclosing a small central 
resin passage with large epithelium cells.’ The writers have 
examined all these rays carefully, and the sketch (text fig. 2) was 
made after a prolonged study of the best preserved one (fig. 6). 
The camera lucida was used to outline this, but a few details were 
added afterward. It shows the tissue continuous from side to 
side of the ray, neither could there be found in this nor in any of the 
others a trace of a ‘‘small, central resin passage with large epithe- 
lium cells.’”’ Fig. 7 shows the only one that could be considered 
to have anything resembling a resin canal in it, and it was found by 
the use of the polariscope that the two darker areas (a and d) in 
this were due to aggregates of crystals of silica. Partial outlines 
of the crystals appear in the photograph. 
Since the writers could find no evidence of resin canals in these 
large fusiform rays, it became interesting to know their real char- 
acter. A significant feature in this connection is the irregularity 
of their margin, which is very different from that found in rays in 
the pines with horizontal resin canals, or even in such abnormal 
cases as those of Sequoia Penhallowii (JEFFREY 3). Around the 
rays, moreover, there is a considerable amount of tangential 
pitting on the tracheids (text fig. 2), a feature which is not found 
in any form known to’ the writers in connection with rays which 
inclose resin canals. This, however, is a feature of medullary rays 
which contain leaf traces, and since we have found undoubted leaf 
