184 
Hill and de Fraine . — On the 
hypocotyl ; indeed, considering the advanced state of preparation in the 
cotyledons for the vascular rearrangements, the assumption of a proper root- 
strticture takes place at a surprisingly low level. 
A well-marked cotyledonary tube is present. 
Alriplex littoralis , L. With regard to the features under discussion 
this plant is practically identical with A. hastata. 
A triplex thamnoides, ?, which has a much smaller seedling, shows some 
differences. It has no cotyledonary tube, the lateral bundles fuse on 
to the central one in the base of the blade of the cotyledons, 
and there is no undue delay in the fusion of the phloem- 
masses within the axis. 
Obione portulacoides , Moq. (Fig. 2). The seed-leaves 
are fleshy and the behaviour of their important vascular 
bundles, both in the cotyledon and in the axis, is precisely 
like those of Atriplex hastata. The laterals, however, 
vary pretty much ; in the lower part of a seed-leaf there 
are, as is usual, two, one on each side of the divided central 
strand ; of these some may die out, especially if very small, 
or may branch into two before coming to an end, or they 
may ultimately fuse with the central strand. 
Spinachia oleracea , L., very closely resembles those 
species of Beta examined. 
Kochia irichophylla , ?. The main features of the transition strongly 
recall those of Calandrinia grandiflora. Each seed-leaf, in its more basal 
region, has the usual bifurcated strand with two laterals 
on each side of it; of these, those situated immediately 
on either side of the central bundle fuse with it, whilst 
those placed on the outermost sides die out. As in some 
species of Amaranthus , Atriplex , and Obione there is a 
delay in the fusion of the phloem in the axis, but this 
is not so well marked in Kochia as in Obione portulacoides. 
Corispermum hyssopifolium, L., closely resembles 
K och ia trie hop hylla. 
Salicornia europaea , L. The seedling of this plant 
(Fig. 3), and also of many other species of the genus, 
has two small fleshy cotyledons which fuse laterally 
towards the base to form a short cotyledonary tube or sheath. This tube 
becomes decurrent down the hypocotyl, forming a succulent ‘ cortex ’, 
a phenomenon exactly paralleled by the leaf-sheaths in the segments 
of the adult plant. 
The distribution of the vascular bundles within the cotyledon is precisely 
1 
Fig. 3. Salicornia 
europaea. Two seed- 
lings, one showing 
the epicotyl in a more 
advanced stage of de- 
velopment. Natural 
size. 
Fig. 2. Obione 
portulacoides. 
Natural size. 
