248 ORR—THE OVULAR INTEGUMENTS IN CLEOME, ETC. 
Cleome, but their subsequent development is more continuous, 
and, as might be expected from the greater size of the seed, the 
amount of fibrous tissue present is relatively increased. The 
fibres are larger in every way than in the preceding species, 
and they retain their protoplasmic contents even in the fully 
developed seed. 
Stomata are present in the outer integument and are still 
evident in the seed condition, but the excrescences typical of the 
seed of Cleome are, of course, absent from the seed-coat of 
Isomeris. The inner walls of the ovary and fruit also possess 
numerous stomata, contrary to the statement of Briquet,* who, 
describing the inner fruit-wall of Isomeris, writes: “‘ Il n’y a pas 
de stomates.”’ 
A further investigation of the ovular structure in other 
genera of the Capparidaceae may show that the features which 
characterise the ovules of Cleome and Isomeris are not confined 
to these genera alone. At the time, it was not possible to obtain 
suitable material for research, and this hypothesis still awaits 
confirmation. 
* J. Briquet in Engl. Jahrb., 1, Suppl. (1914), p. 440. 
EXPLANATION OF PLATE CLXVII. 
Illustrating Mr. M. Y. Orr’s paper on Cleome and Isomeris. 
Photograph of a longitudinal section of the ovule of Cleome spinosa, a, the 
aqueous layer in the inner integument; 6, the lignified tissue round the 
micropyle. 
