of the A natomy of the Genus Selaginella , Spr. 1 5 3 
peel off the cortex proper and articulate in pairs with the 
cndodermal cells (PL IX, Fig. 7). 
The pericycle is two to three layers deep opposite the 
margins of the stele, and three to four layers deep dorsally 
and ventrally. The sieve- tubes are two layers deep dorsally 
and ventrally, but one layer only occurs near the margins, and 
they are entirely absent opposite the protoxylems. The 
xylem is large in amount and forms a broad thin band. 
Procambial tissue is present even in well-developed xylems. 
The xylem is separated from the sieve-tubes by two to four 
layers of small, much elongated parenchyma. 
3. Selaginella Vogelii , Spr. Baker’s Handbook, No. 250. 
Both creeping and erect shoots of this species are 
monostelic, and the course of the leaf-traces and protoxylems 
on the stele are as in S. Martensii. Older stems have no 
trichomata on the epidermis, but young branches have 
a plentiful development of hairs on the ventral surface. All 
these hairs point towards the apex of the branch. They are 
unicellular and strongly cuticularized ; their bases are swollen 
and they taper to a fine point. 
In section the stem is nearly circular and is covered by 
a cuticle and epidermis of the usual type. A considerable 
amount of stereo me occurs in the erect shoots, but the creep- 
ing stems have little or none. The cortex is thin-walled, and 
the cells, especially in the procumbent parts, contain large 
quantities of starch. The cells of the cortex are smaller in 
diameter towards the lacuna. The trabeculae consist of endo- 
dermal cells articulating with one or more parenchymatous cells 
continuous with and creeping over the inner cortex (PI. IX, 
Fig. 8). The pericycle is three to five layers deep. There 
are many crushed protophloem-elements dorsally and ven- 
trally, but these are absent at the margins of the stele. The 
sieve-tubes are absent opposite the marginal protoxylems ; 
elsewhere they are two layers deep. They are separated 
from the xylem by three to four layers of parenchyma. 
4. Selaginella haematodes , Spr. Baker’s Handbook, No. 26 1 . 
This species is in many respects like S. Vogelii. The 
M 
