-1:2-4 -ZV. E. Stevens — New Jersey Palmoxylon. 



so it apparently belongs in Stenzel's class C, — the " Cocoa 

 resembling stems." Again, from the shape of the scleren- 

 chyma portion of the fibrovascular bundles it should be placed 

 in the group "Reniformia" (p. 215), which is characterized 

 by having the sclerenchyma portion of the fibrovascular 

 bundle round or oval in cross section with a flat even surface or 

 broad shallow indentation where it joins the vascular portion. 

 This specimen does not, however, very closely resemble any 

 one of the five species ascribed to the " Reniformia." 



A typical stem bundle, that is one of the " longitudinal 

 bundles," is characterized (fig. 5) by having in the xylem few 

 but rather large vessels with thick walls. As shown in the 

 figure, the sclerenchyma portion of the bundle is nearly oval in 

 outline with a very slight indentation where it joins the vas- 

 cular portion. The sclerenchyma cells near the phloem are 

 considerably smaller than those farther away. No scleren- 

 chyma fibers are present on the axial side of the vascular 

 bundle. The parenchyma cells adjoining the bundles are some- 

 what smaller than those in the remainder of the stem, and the 

 majority of those adjoining the vascular portion are somewhat 

 elongated with the long axis perpendicular to the surface of 

 the bundle. 



Besides the longitudinal bundles, a few bundles were found 

 which apparently belong to the classes designated by Stenzel 

 as " Ubergangsbiindel " or " transition bundles," and " Kren- 

 zungsbiindel" or "oblique bundles." By a ''transition bundle" 

 Stenzel (p. 139) refers to the region where a bundle that goes 

 up through the stem, that is a longitudinal bundle, turns to go 

 out into a leaf. In this transition region the structure resem- 

 bles somewhat that of a bundle going out into a leaf. Stenzel* 

 describes bundles of this type as follows : " The bast region is 

 often smaller while the vascular region is larger ; the periphe- 

 ral vessels (that is those nearest the phloem) are more widely 

 separated and often more numerous, while in place of median 

 vessels we find two or more lateral ones. This type of bundle 

 is especially distinguished by the presence of numerous smaller 

 vessels which are found chiefly toward the axial side of the 

 vascular region." 



It will be noted that the bundle shown in fig. 6 agrees very 

 closely with Stenzel's description of a " transition bundle," 

 although the sclerenchyma region is not markedly smaller than 

 in the longitudinal bundles. This bundle, which is typical of 

 several found in the sections examined, resembles very closely 

 the transition bundles of Palmoxylon Aschersoni. (See Sten- 

 zel, p. 140, fig. 234.) 



By the " Kreuzungsbiindel " Stenzel means those bundles 

 which lead out toward a leaf and so are inclined at a very 

 *Loc. cit. 1, p. 139. 



