of the Anatomy of the Genus Selagindla , Spr, 197 
Unicellular cuticularized hairs, whose cavities are continuous 
with those of the epidermal cells, occur in a few species, e. g. 
►S. Braunii , ►S'. Jlabellata , 5. Vogelii , &c. In such cases the 
erect shoots alone bear hairs. 
The erect stems are strengthened by the development of 
a sclerotic hypodermis which gradually merges into the thinner 
walled general cortex. The cells are much elongated and 
taper at either end. Their walls are thick, and as a rule, deeply 
pitted and give the lignin reaction. Stereome is developed 
chiefly in the erect shoots, and not infrequently is entirely 
absent from the fhizomic parts of the axis. In S. haematodes , 
and other forms, the walls have a bright red colour. In many, 
e. g. S. apus , S. molliceps , &c., the stereome is much reduced, 
never being more than one to two layers deep ; in ►S. spinosa 
(erect axes) the sclerosis is limited to the epidermal layer. In 
others, again, e. g. S. involvens , S. lepidophylla , & c., there may 
be twenty or more layers of stereome. The hypodermal cells 
may contain chlorophyll, though in small amount. In cases 
where the bases of the leaves are swollen, e g. S. rupestris , 
sclerotic tissue may be developed round and on the leaf bases. 
Intercellular spaces are entirely absent from this region. The 
cortex proper varies much in amount, and merges gradually 
on the outer aspect into the peripheral stereome, and inwardly 
into the lacunar tissue. The cells are as a rule long and end 
abruptly, not tapering as in the case of the hypodermal cells. 
They are large and delicate in some forms, such as S. Kraus- 
siana , S. delicatissima , &c., or thick-walled and pitted as in 
S. grandis. The cells are invariably narrower as the lacuna 
is approached. In many species the inner cortical cells are 
narrow and tubular, and very loosely arranged so that inter- 
cellular spaces are by no means infrequent Occasionally, as 
in S. haematodes , the inner cortical cells are sclerotic, and very 
many species show a deposit, more or less abundant, of silica 
both in the intercellular spaces and on the surface-layer facing 
the lacuna. In S. involvens intercellular spaces occur quite up 
to the commencement of the hypodermis. Intercellular spaces 
lined with silica occur in the outer cortex of S. rubella. The 
