Genera Ccraria and Portulacaria. 
I I 2 I 
probably protecting the growing parts during the resting period. Porttda- 
caria has no scale leaves. 
3. The leaves of Ceraria and PortidacaHa are very similar. They 
are fleshy, have no palisade tissue, and possess mucilage cells in the 
mesophyll. 
4. Calcium oxalate is common in the stem and leaf of both genera. 
In the leaf of Ceraria alone, however, crystals occur in the intercellular 
space beneath a stoma. 
5. In the stem of Portulacaria and probably of Ceraria the phellogen 
arises in the epidermis; apparently no phelloderm is formed. 
6 . A large mucilage ring occupies the middle of the cortex in Ceraria. 
In Portulacaria the mucilage cells form a network in the cortex. 
7. In both genera the vascular bundles, which are numerous, are 
arranged in a ring and are separated by medullary rays. 
8. Fibres occur in both xylem and phloem. Simple pits only are 
found. 
9. Drops of oil occur in the cells of the stem of Ceraria. The cell- 
walls of the periderm are impregnated with some fat or oil insoluble in 
chloroform, ether, or benzol. 
Botanical Laboratory, 
South African College, 
April , 1912. 
Literature cited. 
1 . de Bary, A.: The Comparative Anatomy of Phanerogams and Ferns (Eng. trans.). Oxford, 
1884, P« I02 * 
2 . Pearson, H. H. W. : Through Little Namaqualand with the Vasculum and Camera. Gardeners 7 
Chronicle, vol. i, Sept. 9, 1911, p. 191. 
3 . and Stephens, E. L. : Portulacaceae. Annals of the S. A. Museum, ix, 
1912, p. 30. 
4 . Sachs, J. : A Text-book of Botany. Second English edition, Oxford, 1882, p. 66. 
5 . Schimper, A. W. F. : Plant Geography upon a Physiological Basis (Eng. trans.). Oxford, 1903. 
6. Solereder, H. : Systematic Anatomy of the Dicotyledons (Eng. trans.). Vol. i, Oxford, 1908, 
pp. m-13. 
7 . Harvey, W. H., and Sonder, O. W. : Flora Capensis. Portulacaceae. Vol. ii, 1894, 
PP- 385-6. 
8. Stevens, W. C. : Plant Anatomy. Second edition, 1910, p. 323. 
9 . Willis, J. C. : Flowering Plants and Ferns. Third edition, Cambridge, 1908, p. 359. 
10 . Hill, T. G. : Scharlack R, a Microchemical Test for Oil. New Phytologist, vol. xi, no. 2, 
Feb. 1912. 
