ANATOMY OF THE GENUS SALICORNIA. 341 
foliar traces. The two lateral branches derived from each leaf-trace branch 
repeatedly and curve downwards into the basal adnate sheath region, and 
the xylems of the small bundles thus produced are connected by the abundant 
transfusion tracheids. Towards the base of the internode these transfusion 
elements die out, the bundles of the foliar vascular system rapidly diminish 
in number, they become restricted to the plane of the leaf-trace exit 
(r.b., text-fig. 12,4), and, finally, they end blindly in the aqueous tissue. In 
this part of the leaf there is an absence of both the spiral and spicular cells 
found in a similar region in the various species of Salicornia. The median 
bundle of the foliar trace passes steeply upwards, and numerous transfusion 
tracheids develop on its ventral surface. This central strand branches and 
forms several small bundles, the xylem in each being connected with that of 
its neighbour by the transfusion elements (r^. and t., text-fig. 12, 2). Both 
bundles and tracheids finally end blindly in the aqueous tissue, before the 
sheath separates into its two free tips. In the leaf stereides occur abundantly 
in the position marked by the dotted line s, in 1 and 2 of text-fig. 12. Their 
long axes coincide with the long axis of the member in which they occur, 
and they are usually placed in a single layer immediately under the epidermis. 
Their unbranched nature and their usually larger size distinguish them from 
the similar elements which are characteristic of S. glauca. 
In text-tig. 12 (p. 342) the influence of the development of the rosette buds 
on the foliar sheath is shown. 
Fig. 1, which represents a transverse section a short distance above 
the node, shows two buds (0. 4 and 0. 2) whose growth has so eneroached 
upon the adnate leaf-sheath of the pair of leaves of the node above, that the 
latter appears in the form of two wedge-like masses of tissue situated on 
opposite sides of the stem (l. 7). This is exactly comparable to what occurs 
in the case of the flowering segments of Salicornia, where the growth of the 
pair of flower-cymes similarly affects the bract-sheath (cf. text-fig. 5). The 
stem, with its two decurrent foliar wings alternating with the rosette-buds, 
is at this level entirely surrounded by the free foliar sheath of the pair of 
leaves (l. 2) belonging to the node below. In 2, this foliar sheath (l. 2 
has almost entirely fused with the stem, the extreme basal region of the two 
buds (b. 4 and b. 2) is, however, still marked. Soon after the node 1s passed 
(text-tig. 12, 3), preparation for the pair of buds of the node next below 
is seen, in the flattening of the foliar sheath (l. 2 in text-fig. 12, 4), and 
successive sections passing down the internode towards its base, show the 
complete hollowing out of the tissue and the reduction of the sheath to two 
wing-like plates (text-fig. 12, 5). Shortly below the level represented in 5 
the free-leaf tips (/. 3) fuse laterally, forming a sheath round the stem, just 
as is shown in 1. 
T'ext-fig. 13 (p. 343) shows a rosette-bud from an older shoot than the one 
just described. Anatomically the leaves of the bud are identical in structure 
