122 : The Botanical Gazette. [April, 
There is also given an account of the structure of the scale- 
like leaves, which cover the stems under-ground. These con- 
sist of a strongly mechanical tissue, which encloses the 
mestome-bundles, which here often contain a mere leptome. 
This, as it seems, peculiar fact is, however, easily explained, 
since the function of such leaves is not assimilatory; they do 
not need, therefore, the elements of the hadrome, but merely 
the leptome, for the supply of already prepared organic mat- 
ters. The function of the strongly developed stereome in 
these leaves is not only to protect the leptome, but also to 
form a kind of support to the entire stolon. 
As regards the endodermis, the author states several varia- 
tions in the stolons, which he has examined, and which he 
refers to two groups: the so-called Q-endodermis, the cells 
of which are thickened equally all around, while in the second 
one, the C-endodermis, it is merely the inner and the radial 
walls in which a thickening has taken place. A double endo- 
dermis was observed in some species of Triticum, Calame 
grostis and others. (The writer takes here the opportunity 
; in 
and which might give still more extended illustration of the 
gradually succeeded by peltately three or five-lobed mee 
until finally the typical form appears in the nine-lobed le : 
«« domatia” a 
their residence and feed upon a certain kind 0 
These domatia are not present, however, at the ve 
cating ants. This is done by short branches developing 
the lower leaves, having merely two sessile stipules, 
bent downwards and thereby prevent the animals fro 
Ing the stem. It is only when about the twentieth lea : 
ecklinge™ 
fisde 
1Fr, Hildebrand: Eini imlingen und St 
Botan. Zeitung, 1892, “So arta eg ate aap : 
