Xll 
Index . 
PAGE 
Figures. xiii. Three stages in the growth of the ovule in Ephedra (Thoday and 
Berridge) 969 
xiv. Sporangiophore of Ephedra fragilis in bud (Thoday and Berridge) 970 
xv. Diagram of antherophores of the various species of Ephedra (Thoday 
and Berridge) 97 1 
xvi. Diagram of antherophores of Ephedra aspera (Thoday and Ber- 
ridge) 972 
xvii. Two antherophores of Ephedra Torreyana (Thoday and Berridge) 972 
xviil. Series of transverse sections through axis of male strobilus and 
antherophore of Ephedra nebrodensis (Thoday and Berridge) . 972 
xix. Longitudinal section through two synangia of Ephedra nebrodensis 
(Thoday and Berridge) . 973 
xx. Diagram of male flower of Ephedra fragilis (Thoday and Berridge) 973 
xxi. Plans of the ovule of Ephedra distachya (Thoday and Berridge) . 977 
1. Longitudinal section through young seed of Gnetum Gnemon 
(Berridge) 988 
2. Tangential section of a single vascular complex (Berridge) . . 988 
3. Longitudinal sections through a single vascular complex (Berridge) 988 
4. Transverse section through half the base of a flower (Berridge) . 989 
1. Sutcliffia (de Fraine) 1032 
2. Outline tracing of the vascular strands of Section O (de Fraine) . 1033 
3. Transverse section of a very small concentric leaf-trace strand (de 
Fraine) 1034 
4. View of one side of the model of the vascular system of the new 
Sutcliffia (de Fraine) 1034 
5. View of the other side of the model of the vascular system of the new 
Sutcliffia (de Fraine) 1035 
6. Transverse section of the primary wood of Sutcliffia insignis (de 
Fraine) 1036 
7. Transverse section of the primary wood of the new Sutcliffia (de 
Fraine) 1036 
8. Tracings showing the breaking up of the ‘ meristeles’ a and /3 (de 
Fraine) 1038 
9. Tracings showing the breaking up of the ‘ meristele’ 7 (de Fraine) 1040 
10. Part of a radially symmetrical leaf-trace bundle (de Fraine) . . 1043 
11. Transverse section of part of the primary xylem of a meristele (de 
Fraine) 1044 
12. Transverse section of part of the wood of the stele (de Fraine) . 1045 
13. Transverse section of secondary phloem (de Fraine) . . . 1046 
14. Transverse section of a radially symmetrical leaf-trace bundle (de 
Fraine) 1048 
15. Transverse section of a unilateral leaf-trace bundle (de Fraine) . 1049 
16. Transverse section of a leaf- trace bundle showing periderm formation 
(de Fraine) 1050 
17. Transverse section of secondary cortex (de Fraine) . . . 1051 
18. A, Beginning of phellogen formation ; B, later stage of cork cambium 
development (de Fraine) 1052 
19. Transverse section of part of an extrafascicular strand (de Fraine) 1053 
1. Ephedra distachya (Thompson) . 1080 
2. Ephedra altissima (Thompson) 1081 
1. Ceraria gariepina (Michell) 1112 
2. Ceraria namaquensis (Michell) . . . . . . .1115 
3. Bark of Ceraria gariepina (Michell) 1116 
4. Portulacaria afra (Michell) 1118 
1. Begonia semperflorens, var. gigantea, Lemoine (DUmmer) , . 1123 
