33i 
and its Mycorhiza . 
where the axis is inserted on the absorbing organ, straight 
hyphae run longitudinally in the cortex and are continuous 
with the mycorhizal hyphae ; they stretch only a short 
distance up the inflorescence-axis. 
The endodermal cells are uneven in size: they have thin 
suberised walls ; the lateral walls have the dots (which how- 
ever are not invariably on walls actually radial). 
The stele is considerably larger than in the absorbing organ. 
There is a single somewhat irregular layer representing the 
pericycle. Within are three collateral bundles and a paren- 
chymatous pith. 
The phloem is tangentially extended, and consists of sieve- 
tubes with terminal plates, companion-cells, and less proto- 
plasmic parenchymatous cells. 
The xylem is better developed than in the absorbing organ. 
The protoxylem, represented by narrow disintegrating spiral 
and annular vessels, is not exactly radially internal to, but 
slightly on the side of the mass of xylem. Besides these 
vessels there are in each bundle 4-8 (in transverse section) 
broader intact spiral and annular tracheae, the segments of 
which are long and tapering. 
Histology of the Scales. 
The scales are simple in structure. An epidermis with 
thin cuticle and devoid of stomata covers a mesophyll con- 
sisting of two layers of large parenchymatous cells including 
small intercellular spaces. A single vascular bundle with 
xylem and phloem runs up the middle of the scale. The 
only point of interest in the leaves is that they contain 
amongst the mesophyll-cells many raphide-mucilage cells, as 
is often the case with scales on the flowering axes of holosa- 
prophytes. 
Structure of the Absorbing Organs. 
On a relatively main axis there are borne tufts of smaller 
branches, which are lateral absorbing organs, and young buds 
A a 
