232 Worsdell . — The Vascular Structure of 
Ceratozamia latifolia, Miq. 
Male Sporophyll. The course of the bundles from the 
central cylinder of the axis of the male cone to the sporophyll 
has been thoroughly described by Thibout in C. mexicana, 
Brongn. 1 The occurrence of medullary bundles in the axis 
has also been mentioned and figured by him 2 , and by Scott 3 
in that species. In the present species I observed in one 
case three small bundles lying in the pith immediately within 
the normal ring which, one after the other, end blindly 
upwards. In another case a single large bundle in a similar 
position was traced upwards for a long distance ; in one part 
of its course it split into two bundles which directly after- 
wards again fused together into one. It twice partially fused 
with a bundle of the ring during its course, but was not seen 
to completely fuse therewith. A similar large bundle, which 
at first was collateral, became higher up concentric , and at 
a still higher level again collateral ; it eventually ended 
blindly in the pith. These characters are confined, in this 
species, to the male cone ; they do not, however, occur in 
the male cone of C. Miqueliana , H. Wendl. 
In the lowest part of the stalk of the sporophyll three 
bundles occur, of which the median one is much smaller than 
the others ; the centrifugal xylem is clearly defined and 
brightly coloured, and there is no sign of any centripetal 
xylem. For the rest, the structure is similar to that of the 
bundles in the male sporophyll of other genera. 
Ceratozamia mexicana, Brongn. 
Male Sporophyll. In the lowest part of the stalk are three 
bundles, the median one as in the last species, being much 
smaller than the others, and lying out of the row or a short 
distance towards the dorsal side (Fig. 26). In the sterile 
1 Loc. cit. p. 23. 2 Loc. cit. p. 24. 3 Loc. cit. p. 412. 
