235 
The integument is for three thirds of its height con- 
crescent with the nucellus and a definite line of demarcation 
between them is not to be traced. At the top, where the 
integument is free from the nucellus, it forms the canopy, 
formed by eight segments. 
Àt the outer side the integument is covered by a clearly 
marked epidermis, composed of oblong bricklike cells, that 
mostly bear papils at their outerside, which segregate 
mucilage. Àt the top near the micropyle, on the lobes of 
the canopy these cells change their forms and become 
very long, forming then the so-called ,frill”. 
Under the epidermis is a layer of sclerotic cells, this 
hypoderma perhaps may be compared with the palisade- 
layer of Lagenostoma. 
The nucellus is for its greater part filled up by the 
embryosac, and at its apical side it is dome-shaped, 
bearing the lagenostome, a hemi-sphaerical mass of tissue 
surrounded by the annular pollenchamber. In Sphaerostoma 
the pollenchamber has always been found closed, caused 
by a solid closure, made by the dome of the lagenostome, 
at the place where it stands on the nucellus. Às is the 
case in Lagenostoma the pollenchamber is formed as a 
lysigen cavity. | 
In the pedicel under the plate of sclerotic fibres running 
beneath the chalaza as a continuation of the sclerenchyma 
of the integument there is a thin layer of tissue, in which 
the separation takes place, when the seed is ripe and is 
shed off. The cupule remains on the plant. 
$ 7. Physostoma elegans Will. 
Literature: Oliver (104). 
Figure: 104. p. 76. 
Physostoma elegans is an oblong seed and has a length 
Recueil des trav. bot. néerl. Vol. XVII. 1920. 16 
