226 LEMNACE. 
` (1) Grantia microscopica. 
Flos axilis e centro pagine superior exserta, spatha o. 
Anth. unolcularis. 
There is I think one other species of this genus which was 
known to Roxburgh as Lemna globosa(?) I have not hi- 
therto met with it in flower. 
It is still more minute, the longest diameter being +, the 
shortest about } of a line. The fronds are green, oblong or 
nearly elliptical, and flat throughout a certain portion of the 
upper surface, otherwise very convex. 
The flat discoid part is provided with stomata of LARGE 
size, the annulus of which is quite entire. As in the first 
species, these organs give the surface a papilose appearance. 
The similarity in appearnce between the fronds and the ovula 
is remarkable enough. 
The cells of both surfaces contain globuline. The large 
central cells are nearly devoid of this, as well as those 
forming the neck of the aperture, from the point where the 
young frond is exserted. 
The reproduction by fronds consist of a continued succes- 
sion of young fronds, developed opposite the attachments of 
each older one, these are at first enclosed, but as the deve- 
lopment commences near the margin, they are not long in 
coming into immediate contact with the water in which they 
row. Their similarity with the plumule is likewise remark- 
able, in fact no difference exists between them. 
e exit of the plumule is also sufficiently like that of 
the frond, for it must be remembered that it is not terminal, 
otherwise it would carry up with it the cap of the nucleus. 
It is this plant which may truly be called a reduced Aroidea 
it will from the transition between the two orders. 
(?) It must be remembered that the stamens of Lemna are 
hypogynous, a distribution not perhaps known in true Aroi- 
dea, in which they are always at a distance from, and above 
female organs 
Lemnacez, represent Podostemon in Dicotyledons, and 
