6io Pearson. — On the Micro sporangium and Microspore of 
. - A 
✓ 
.. 
from the nodes of which the flower-traces are derived. The bundles of this 
outer series are apparently homologous with the outer series of the female 
spike in G. scandens 1 and G. africanum , 2 and, in that case, are not represented 
in the male spike of the 
former species (Text- 
fig. 2). In addition to 
the outer series there is 
in the male spike of G. 
africanum and of G. Buch- 
holzianum , an inner series 
of flower-traces, inversely 
orientated through the 
whole or the greater part 
of their course. Arising 
either from the leaf-traces 
in close proximity to their 
insertion on their parent- 
bundles, or directly from 
the parent-bundles them- 
selves, either at some point 
within the node or in the 
lower half of the next 
higher internode, they pass 
upwards within the cortex 
for a longer or shorter 
distance before turning 
sharply downwards to join 
the floral complex at the 
level of the uppermost 
flowers of the node (Text- 
fig. 3, i.t.). After separat- 
ing from the leaf-traces 
or ring-bundles the as- 
cending traces frequently 
run up so close to the ring- 
bundles that their phloem 
groups fuse ; a transverse 
section through such a 
combination shows a more 
or less complete amphi- 
vasal structure. Quite exceptionally such a case as that shown in Text-fig. 4 
is found. Here the main trunk of the leaf-trace leaves the ring-bundle at the 
1 Thoday (’ll), Text-fig. 2, OB. 2 1 . c., Text-fig. 3, ob. 
It 
Text-fig. 3. Longitudinal section through two nodes and 
an internode of G. Bzichholzianum (one half only shown ; the 
letters p.c. stand in the pith cavity), i.t. = internodal flower- 
trace ; m.c, = mucilage cavity in the leaf cupule. Other 
lettering as in preceding figures, x 15. 
