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SOME NEW SOUTH AFEICAN SUCCULENTS. Paet IV" 
By E. Marloth, Ph.D., M.A., F.E.S.S.Af. 
(Plate XXYII.) 
(Eead June 16, 1909.) 
Among the plants, which I am describing in this paper, are a few with 
a peculiar structure of their leaves. It will be remembered that a year 
ago t I exhibited a species of Bulhine,\ with window-leaves, pointing 
out at the time that such a structure has not been observed on any- 
other plant as yet. 
The very succulent, nearly egg-shaped leaves of the plant remain 
embedded in the ground, hence the blunt apex only becomes visible. 
Here the green tissue is absent, being confined to the sides of the leaf. As 
the sides are surrounded by soil, the light cannot reach them in the 
ordinary way, but only by entering through the window at the apex, 
illuminating the leaf from within. 
Since then I have found five other species of plants with such 
"window-leaves," viz., four s^peGies ot MesembriantJmnimi,^ and one species 
of Haivorthia.W They are all stemless succulents with the leaves embedded 
in the ground, showing only the Hat or convex apex, which is entirely 
devoid of green tissue. Hence, as in the case of the Bulhine, the light can 
reach the green tissue of the leaf only through the window, illuminating 
the leaf from within. It should be noted, that while in the case of the 
Bulhine there is no epidermis at the window the other five plants have a 
complete epidermis. 
* Part I. appeared in the Transactions of the South African Philosophical Society, 
vol. xviii., pt. 1, 1907. 
f See Eep. of Proc. Roy. Soc. S.A. of meeting held June 17, 1908. 
inc ineseinhviautlieiiioides , Haw. See Plate XXVII., fig. 1. 
§ Two of these are described in the present paper, the two others are 31. truncatdlum 
Haw. and M. Hooker i, Berger, 
II This species is the same as that named Haworthia triiiicata by Dr. Schonland in 
the paper read at the same meeting as the present paper ; hence, in order to avoid a 
synonym, I have cancelled the description and name given by me. 
