the Anatomy of the Genus Selaginella , Spr. 139 
25. S. Wallichii, Spr. 
Ventral leaf. Oblong oblique, bluntly pointed, without marginal 
spines. Stomata occur on the margin on the ligular face, as well as 
abundantly on the aligular surface. 
Dorsal leaf. Similar in shape but cuspidate. Stomata occur on 
both ligular and aligular surfaces. 
Section. As in A. Wildenowii. 
26. S. Wildenowii, Bak. (Figs. 30, 31.) 
Ventral leaf Oblong, unequal -sided, with crenate non-spiny 
margins. Stomata occur on the aligular face only. 
Dorsal leaf. Oblong, unequal-sided, cuspidate. Stomata distributed 
over the aligular face only. 
Section. The ligular epidermis in section is composed of obconic 
cells with one or two large chloroplastids in each, having their truncated 
apices continuous with a reticulate mesophyll. The aligular epidermal 
cells are much deeper in the centre than where they touch each other. 
The walls of the guard-cells are frequently thickened. 
27. S. canalieulata, Bak. (Fig. 20.) 
Ventral leaf. Awl-shaped, or rhomboid with a sclerotic margin 
and a few spines near the apex. A few stomata occur near the 
margin of the ligular surface, as well as abundantly on the aligular 
face. 
Dorsal leaf. Similar in shape but cuspidate. Stomata occur on 
the aligular face only. 
Section. As in S. Wildenowii , save that in most of the lamina the 
reticulate mesophyll is wanting, and the ligular peg-shaped cells rest 
directly on the aligular epidermis (Fig. 20). 
28. S. Mettenii, A. Br. 
Ventral leaf. Oblong, obtuse, pointed, with sclerotic faintly spiny 
margins. A very few stomata occur along the margin of the 
ligular face. Stomata are generally distributed over the aligular 
surface. 
Dorsal leaf Ovate, oblique, with sclerotic non-spiny margins. 
The stomata occur on the aligular face only. 
Section. The vascular bundle runs the whole length of the leaf. 
The mesophyll-cells are very short. 
