140 Gibson . — Contributions towards a Knowledge of 
29. S. Lobbii, Moore. 
Ventral leaf. The shape of the ventral, axillary, and dorsal leaves 
is that of the leaves of S. inaequalifolia. The margin of the ventral 
leaf is sclerotic but not spiny. Stomata occur on the aligular 
face only. 
Dorsal leaf Stomata distributed chiefly over the lamina on the 
aligular face— absent from the ligular epidermis. 
Section . As in A. Wildenowii. 
30. S. gracilis, Moore. 
Ventral leaf Bluntly pointed, ovate or hastate with the bases 
produced, that on the side next the stem uncinate. A few stomata 
occur on the ligular face near the margins. The edges are smooth 
and sclerotic. 
Dorsal leaf Similar in shape, cuspidate. Stomata occur on the 
aligular surface only. 
Section. As in A. Wildenowii . 
31. 5. viridangula, Spr. 
The leaves of this species are oblong oblique, the dorsal leaf 
cuspidate. The dorsal leaf has stomata on both ligular and aligular 
surfaces, but the ventral leaf has stomata on the aligular surface only. 
Section. As in S. Wildenowii. 
32. S. chilensis, Spr. 
Both ventral and dorsal leaves are lanceolate, almost equal-sided 
and with produced bases. Both have marginal sclerotic cells, but the 
margins are only very faintly spiny. A few stomata occur on the 
ligular face of the ventral leaf near the margin, but none occur on 
the same face of the dorsal leaf. In section both leaves conform 
to the type described for S. Wildenowii. 
33. S. Victorias, Moore. 
Ventral and dorsal leaves are both oblique sickle-shaped, with blunt 
apices, sclerotic margins, and without marginal spines or hairs. 
The stomata, which occur only on the aligular face of the ventral 
leaf, are frequently clustered. Stomata occur on both sides of the 
dorsal leaf. 
Section. The ligular epidermal cells are long, narrow, and closely 
packed, and merge into the reticulate mesophyll through an inter- 
mediate semi-palisade-layer. 
