334 DR. E. DE FRAINE ON THE 
II]. SPIRAL CELLS ONLY, 
a. Always very few. Very often entirely absent in the vegetative 
shoots. 
. pusilla, Woods. 
S. ramosissima, Woods. 
S. appressa, Du Mort. 
S. herbacea, Linn. 
S. prostrata, Pall. 
a 
b. Absent in the vegetative shoots. Few in the reproductive 
shoots. 
S. prostrata, var. Smithiana, Moss. 
IV. STEREIDES AND SPIRAL CELLS ABSENT. 
S. Oliveri, Moss. 
S. dolichostachya *, Moss. 
THE STEM. 
Primary Structure, 
The primary vascular cylinder of the stem is built up entirely of leaf- 
traces; in the upper region of the internode eight open collateral bundles are 
found, this number being reduced to six before the node below is reached. 
The course of the bundles in the stem of Salicornia perennis is very simple: 
one foliar trace enters the stem from each leaf at the node ; it very rapidly 
enters the central ring of primary bundles and then passes vertically down- 
wards through one complete internode and the upper part of the internode 
below, fusion with the adjacent bundle then takes place. The course of the 
primary bundles ean. be more readily understood by reference to text-fig. 9, 
which represents the central vascular system of three internodes laid out 
flat. 
We examined the course of the primary bundles in a young plant of one 
of the annual species (probably 5. prostrata var. тапа), and found the 
resemblance to that of the perennial S. perennis was very close. It was 
strikingly different from that described by Fron f for “ S. herbacea, L.” 
According to the latter observer the entering leaf-trace passes vertically 
down an internode, but immediately above the node it bifureates, after the 
node is passed each of the bundles thus formed fuses with the adjacent 
vascular bundle; throughout the greater part of the internode the primary 
vaseular ring consists of six bundles, just before the node is reached the 
* The specific characters of this species have been described by Dr. Moss in the ‘New 
Phytologist,’ xi. (1912) p. 409. 
+ Ann. Se. Nat. sér, 8, Bot. ix. (1899) p. 157. 
