134 Gibson. — Contributions towards a Knowledge of 
One of these is shown in section. The reticulate mesophyll is of the 
usual nature common to species belonging to this type. Two warty 
sclerotic fibres cut across are shown in the aligular epidermis. 
10. S. stenophylla, A. Br. 
Ventral leaf. Oblong-ovoid, bluntly pointed, and slightly spiny. 
Sclerotic warty fibres occur on the ligular face ; warty sclerotic 
marginal cells alternate with marginal stomata. Similar sclerotic 
fibres occur on the aligular face, where there are numerous stomata. 
Dorsal leaf. The leaf is ovate with a long cusp and spiny margin. 
The marginal cells are sclerotic, and the leaf has backwardly directed 
lobes as in A. Karsteniana. No stomata occur on the ligular face, 
though there are numerous sclerotic warty fibres. These also occur 
on the aligular face. The stomata occur not only over the midrib, 
but at the margins as well. 
Section . As in the type. 
The vascular bundle of the leaf of this species will be referred to later. 
11. S. viticulosa, Klotz. (Figs. 2, 9, 10, 16, 22.) 
Ventral leaf Ovate, oblique, bluntly pointed, with short basal lobes. 
The margin is formed of elongated pitted cells, from almost every one 
of which unicellular spines arise. The spines are much shorter near 
the apex. Stomata occur on the aligular face only, in 4-5 rows 
over the midrib. Many of these have sclerotic walls (Figs. 9, 10), and 
not infrequently one meets with abnormal stomata with three guard- 
cells (Fig. 10); whilst on some leaves I have found the stomata 
grouped in twos and threes (Fig. 2). All the cells of the aligular 
surface are elongated and sinuous, and provided with two rows of 
cuticular warts (Fig. 16). The cells near the midrib are shorter and 
have less sinuous walls. The cells of the ligular face are wavy 
and polygonal, but become more elongated towards the margin of the 
leaf; there are no stomata on this face. 
Dorsal leaf. Ovate pointed, oblique, with long cusp. The margin 
is spiny, and the trichomes are especially long on the basal lobes. 
Several of the epidermal cells of the aligular surface of the basal lobes 
bear trichomata. Stomata occur in four or more rows over the midrib 
on the aligular face; a few also occur on the inside lobe. The 
stomata are often sclerotic and abnormal, as in the case of the ventral 
leaf. No stomata occur on the ligular face. 
Section. As in the type. 
