142 Gibson. — Contributions towards a Knowledge of 
some of them sclerotic, but bears no stomata. The aligular surface is 
composed of elongated wavy cells with interspersed sclerotic fibres 
and stomata over the entire surface, but not actually on the margins. 
Section. As in S. molliceps. 
I have already drawn attention to the variation in length 
and form of the epidermal cells in species with leaves of the 
Martensii- type, but one may say in general terms that the 
preceding thirty-five species have the ligular surface of 
the ventral leaf and the aligular of the dorsal leaf composed 
of polygonal cells, whilst the aligular surface of the ventral 
and ligular of the dorsal leaf are formed of cells obconic in 
section and with polygonal bases. In the succeeding species 
the epidermal layers on the ligular and aligular faces are 
approximately similar, and the cells are all elongated. 
B. Braunii-type. 
Three species come under this heading, viz. 5 . Bratmii , 
6\ concinna , and A'. Bakeriana. All agree in that the epidermis 
of both the ligular and aligular surfaces consists of elongated 
sinuous cells, and in having a distinct palisade-layer as well 
as reticulate mesophyll. Indications of a palisade-layer in 
species of the Martensii - type have already been noted. 
37 . S. Braunii, Bak. 
Ventral leaf. Ovoid with crenate or faintly spiny margins. The 
cells of the ligular face are elongated, verging to polygonal, whilst 
those of the aligular face are short with wavy margins. Numerous 
stomata occur on the aligular surface. 
Dorsal leaf. Lancet-shaped, pointed, but without spines on the 
margin. The ligular epidermis, which bears stomata, is composed 
of short wavy margined cells, whilst the aligular surface is covered 
by polygonal or slightly elongated cells, with numerous stomata over 
the midrib. 
Section. As in S. concinna. 
38 . S. concinna, Spr. (Figs. 7, 24, 25.) 
The leaves are somewhat peculiar in shape. The ventral leaf is 
ovate but very unequal-sided, and has two long spiny backwardly 
