the Anatomy of the Genus Selaginella , Spr. 141 
The three following species have delicate leaves, and whilst 
retaining the characters of the species already described in so 
far as the epidermis is concerned, yet differ in having little 
or no mesophyll save in the immediate vicinity of the vascular 
bundle. Hence the ligular peg-like cells come to rest directly 
on the elongated epidermal cells of the aligular surface. In 
this respect a section of the leaf resembles that of .S. canalicu- 
lata (Fig. 20 ), a species which might be considered as forming 
a transition to this section. 
34. S. mollieeps, Spr. 
Ventral leaf. Ovoid but unequal-sided, delicate, with long warty 
sclerotic marginal cells, and spines which are especially long on the 
outer margin. Stomata occur over the midrib and along the margin, 
but are absent from the ligular face. 
Dorsal leaf Ovoid, but not so unequal-sided, and cuspidate, with 
spiny sclerotic margin. Stomata occur all round the margin and on 
the aligular face. 
Section. The obconical ligular cells rest directly on the aligular 
epidermis. 
35. S. apus, Spr. 
Ventral leaf. Oblique, unequal -sided, acuminate, with a faintly 
spiny margin. Stomata occur on the aligular surface as well as 
near the margin. 
Dorsal leaf. Oblique, tapering, slightly spiny. Stomata occur on 
the ligular surface near the margin, and occasionally actually on it. 
The aligular epidermal cells are warty, and stomata occur all over the 
surface. 
Section. As in S. mollieeps. 
36. S. albonitens, Spr. 
Ventral leaf Lanceolate, acuminate, unequal-sided, faintly spiny 
along the margin. The polygonal cells of the ligular face have inter- 
spersed long sclerotic cells with stomata along the margin. Similar 
sclerotic cells occur among the elongated cells of the aligular face. 
Stomata are distributed over the entire surface, and a few occur on 
the margin itself. 
Dorsal leaf. Ovate, with long pointed apex. The margin is spiny 
and warty. The ligular face is composed of elongated warty cells, 
