1 Table of Contents: “... Accumulation of Ash Elements and pH Changes -- 22 Vegetational Changes on Aging Landforms in the Tropics...”

2 Table of Contents: “...1. Introduction -- 2. The physical environment -- 2.1. Geology and geomorphology of Southern Africa...”

3 Table of Contents: “... Ancestral Habitats: Dark and Moist or Exposed and Dry? -- 2.2 The Geologic Record of Epiphytism -- 2.3...”

4 Table of Contents: “... Patterns -- 2 Biogeographic Patterns: A Perceptual Overview -- 2.1 Introduction -- 2.2 Patterns -- 2.3...”