CALAMOPITYEAE 



481 



through the secondary wood, and evidently belonged 

 to the leaf-trace bundles. Their structure is typically 

 mesarch ; in the large strands, approaching their exit, 



Fig. 177. — Calaniopitysfascicularis. Transverse section of central part of stem, showing 

 the pith (rather contracted), the primary xylem-strands, and part of the secondary 

 .wood. A, large xylem-strand, about to pass out to a leaf; B, still larger strand, 

 already on the way out ; fix, protoxylem-groups ; C (arrow), direction of another 

 outgoing strand ; a, />, c, reparatory strands of the bundles A, B, C. d, c, main and 

 reparatory strands of two other leaf-traces, lower down in their course. x 20. 

 Kidston Coll. 54 oa. (G. T. G.) 



the protoxylem is central ; lower clown, as the strand 

 diminishes in diameter, the centripetal wood becomes 

 relatively reduced in amount. In the lower part of 

 their course the xylem-strands become embedded in 



