130 AROIDE. 
"The pollen is apparently perfected at a very early period, and 
as it always consists of very unequal grains, which indeed 
present every gradation of size, we may conclude that it is 
formed by the augmentation of an originally simple granule, 
not as is perhaps generally the case, by the 3-nary, or 4-nary 
division of an originally simple grain. The cells of the endo- 
thecum nextthe connectivum, are the only ones that are 
marked with incomplete fibres, perpendicularly disposed to 
the endothecum, and with a tendency to connivens, The 
cells themselves are globular. 
The ovula have 3 coats, two of which are permanent, the 
inner one being in the seed, excessively thin. 'The albumen 
is formed within the nucleus, which is an exception to my 
albuminary sac ; (it remains to be shewn however, whether the 
nucleus is not itself always a membraneous sac.) and at its 
apex, and within a saccule attached originally to the apex of 
the nucleus, is developed, the embryo. If this saccule is in . 
the fully ripe seed to be detected, Houttuynia must be re- 
ferred to Saururez. 
Arum colocasia, and A. fornicatum of Roxburgh, are Cala- 
dia, which is distinguished from Arum by habit, by a tendency 
to trilocularity of the ovarium, its well developed stigmata, 
pluri ovula, and by the anthers, which are plurilocular ? In Ca- 
ladium and Colocasia, the anthers often preserve the typical 
form, andare only bilocularly 4 locular, in other cases they 
are 6 locular, they open only by their upper part. 
Abortive ovaries of varied forn occur among the de- 
veloped ones, in the upper portion these pass obviously into 
the central glands, as do the pee ones of these into the 
stamina, 
In C. fornicatum, the style is a ты deal, and the stigmata 
are much developed. 
Glands scarcely occur mixed with the ovaries, the lower 
ones are of very irregular form, the others so closely locked 
as to give the spadix here a mere reticulated appearance, the 
