66 STUDIES IN FOSSIL BOTANY 



bundles which run to the subtending bracts, and 

 immediately above them. The sporangiophore bundle, 

 however, passes vertically upwards, parallel to the 

 corresponding main bundle of the axis, until it has 

 ascended through almost exactly half the internode. 



Fig. 27. — Palaeostachya vera. Diagrammatic longitudinal section of cone. Vascular 

 tissue, black; soft parenchyma, dotted', sclerised, lined. Left side passes through 

 bundle ; right, between bundles. Sporangia omitted on left side ; inserted on right 

 in surface-view. D.C., disc canal ; px.C.^ protoxylem canal of main bundle ; Spx.C, 

 protoxylem canal of sporangiophore trace ; j>x., persistent protoxylem at the node. 

 Note the sharply reflexed course of the bundles supplying the sporangiophores. From 

 Hickling. 



It is then sharply reflexed, descends rapidly to the 

 upper limit of the nodal disc, and sweeps horizontally 

 across the upper part of this to the base of the 

 sporangiophore, which it enters 1 (Fig. 27). Thus in 

 Palaeostachya^ as in Calamos tacky s> the evidence of the 

 1 Hickling, I.e. p. 375. 



