the Anatomy of the Genus Selaginella, Spr . 131 
Section. (Unless otherwise stated, the section described is that of 
the ventral leaf.) On the ligular face the cells are cuticularized and 
obconic, and rest on the lower or aligular epidermis at the margins, but 
are separated from it in the thicker regions of the leaf by reticulate 
mesophyll. 
2. S. grandis, Moore. 
Ventral leaf. The leaves are long, rhomboidal, and sharply acumi- 
nate, on the whole equal-sided, and bear shorter or longer spines on 
the base only. The ligular epidermis consists of polygonal cells, 
becoming more elongated and wavy towards the margins. A few 
stomata occur on this face. The aligular epidermis consists of 
elongated sinuous cells, becoming shorter over the midrib and having 
scattered sclerotic warty fibres. The stomata are in several rows over 
the midrib. 
Dorsal leaf. The leaves are ovoid pointed oblique with long 
spiny apices. The ligular face bears no stomata, though these are 
numerous on the aligular surface. Epidermis as in the type. 
Section. As in A. Mariensii. 
3. S. Vogelii, Spr. 
Ventral leaf Leaves triangular ovoid, with blunt apices and without 
marginal spines. Stomata occur on both ligular and aligular surfaces, 
though more numerous on the latter. 
Dorsal leaf. Leaves oblique ovoid, small, with long apices and 
without marginal spines. Stomata occur on the aligular surface only. 
Section. As in the type. 
4. S. haematodes, Spr. 
Ventral leaf. Leaves oblique, ovoid, acute, faintly spiny on the 
outside margin. The polygonal cells of the ligular face become long 
and wavy bordered nearer the margins ; no stomata. The walls 
of the aligular epidermal cells have irregular thickenings similar to 
those figured as occurring in A. producta (Fig. 6). The stomata are 
surrounded by similar cells, and warty sclerotic fibres occur among the 
epidermal cells. 
Dorsal leaf. Leaves ovoid, oblique with a long cusp ; margin 
faintly spiny. The ligular epidermis has no stomata, but has the 
same irregular thickenings that occur in the cells of the aligular 
epidermis of the ventral leaf. The aligular epidermal cells are 
K 2 
