Nub 21. s MM E EC. 
NOTES ON CALAMOPITYS. 221 
been able to determine the phyllotaxis. In the section figured (Phot. 27) 
two traces in almost the same phase (about 2 mm. from the pith) are nearly 
opposite each other; the arrangement, however, was certainly not decussate 
or distiehous, as shown by the position of other traces. Probably it was a 
fairly complex spiral. 
I have seen no certain case of the división of the protoxylem in the out- 
going leaf-trace. The strand shown in Phot. 28, cut almost transversely in 
a tangential section of the wood, appears to have a single median protoxylem. 
The secondary wood, as in C. fascicularis, has a Cordaitean character, with 
the medullary rays seldom more than one cell in width (Scott, 1902, Pl. 4. 
fig. 12). The pits of the secondary tracheides are most often in two rows, 
sometimes in a single row ; they are often scattered, and even when in 
contaet, do not always show an hexagonal form. Those of the primary 
elements are in numerous irregular rows (l: c. Pl. 4. fig. 11). 
The species C. Beinertiana clearly has much in common with C. fascicularis, 
though the large size and peculiar structure of the pith give it a very 
different anatomical habit. Doth species have advanced further in a 
Gymnospermous direction than the three first described, and, of the two, 
C. Beinertiana shows the greater progress. 
SYNOPSIS. 
A concise synopsis of the chief characters of the five species may be of 
service for reference. 
1. Xylem-strands of fairly uniform size, all mesarch. 
Rays usually multiseriate. 
Petiole with Kalyima structure. 
A. Xylem-strands usually eecentrically mesarch, with protoxylem 
outwards, connected to form a nearly continuous zone. Medul- 
lary tracheides present *. 
C. americana (from Kentucky). 
C. annularist (from Central Germany). 
B. Xylem-strands usually centrally mesarch ; quite separate from one 
another. Medullary tracheides probably absent. C. Saturni. 
2. Xylem-strands of very unequal size; large and centrally mesarch in 
the upper part of their course, becoming small and nearly or quite 
endarch lower down. 
Rays usually uniseriate. 
(Petiole unknown.) 
* Proved for C. americana; highly probable for C. annularis. 
+ It would be premature to give distinctive characters at present. In the meantime the 
localities prevent any confusion. 
LINN, JOURN,— BOTANY, VOL, XLIV, T 
